Update myst-parser to 2.0.0

[pyup-bot]

This PR updates myst-parser from 0.18.0 to 2.0.0.

Changelog

2.0.0

This release primarily updates core myst-parser dependencies,
with some minor changes to parsing behaviour:

* ⬆️ UPGRADE: `markdown-it-py` to v3 (<gh-pr:773>)
* This is mainly a non-breaking change, fixing some edge cases in parsing
* See: <https://github.com/executablebooks/markdown-it-py/releases/tag/v3.0.0>
 and <https://github.com/executablebooks/mdit-py-plugins/releases/tag/v0.4.0>

* ⬆️ UPGRADE: `linkify-it-py` to v2 (<gh-pr:675>)
* Also fixes some edge cases in parsing
* See: <https://github.com/tsutsu3/linkify-it-py/blob/main/CHANGELOG.md>

* ⬆️ UPGRADE: Add support for `docutils` v0.20 (<gh-pr:775>)
* No significant changes, see <https://docutils.sourceforge.io/RELEASE-NOTES.html#release-0-20-2023-05-04>

* ⬆️ UPGRADE: Add support for `sphinx` v7, and remove v5 support (<gh-pr:776>)
* No significant changes, see <https://www.sphinx-doc.org/en/master/changes.html>

* ⬆️ UPGRADE: Remove Python 3.7 support and add testing for Python 3.11 (<gh-pr:772>)

* 👌 Improve default slug generation for heading anchors, thanks to <gh-user:Cimbali> (<gh-pr:777>)
* This change makes the slug generation closer to GitHub, in that, starting/ending whitespace will not be stripped.
 For example, `` ` a` b `c ` `` will now correctly create the slug `-a-b-c-` and not `a-b-c`

* 👌 IMPROVE: Substitution extension (<gh-pr:777>)
* Allow any value type (including dict, list, datetime) and emit a `myst.substitution` warning for errors in resolving the substitution content.

* 🧪 Introduce a gate/check GHA job, thanks to <gh-user:webknjaz> (<gh-pr:635>)

**Full Changelog**: [v1.0.0...v2.0.0](https://github.com/executablebooks/MyST-Parser/compare/v1.0.0...v2.0.0)

1.0

This release updates the code-base to fully support the [markdown-it-py](https://markdown-it-py.readthedocs.io) `v1.0.0` release.
In particular for users, this update alters the parsing of tables to be consistent with the [Github Flavoured Markdown (GFM) specification](https://github.github.com/gfm/#tables-extension-).

New Features ✨

- **Task lists** utilise the [markdown-it-py tasklists plugin](inv:markdown_itmd/plugins), and are applied to Markdown list items starting with `[ ]` or `[x]`.

markdown
- [ ] An item that needs doing
- [x] An item that is complete


Add "tasklist" to the `myst_enable_extensions` configuration to enable.

See [the optional syntax guide](docs/syntax/optional.mdtask-lists) for further information.

- The **`sub-ref`** role has been added for use identical to ReST's `|name|` syntax.

This allows one to access Sphinx's built-in `|today|`, `|release|` and `|version|` substitutions, and also introduces two new substitutions: `wordcount-words` and `wordcount-minutes`, computed by the markdown-it-py [`wordcount_plugin`](https://github.com/executablebooks/mdit-py-plugins/pull/20).

markdown
> {sub-ref}`today` | {sub-ref}`wordcount-words` words | {sub-ref}`wordcount-minutes` min read


See [the roles syntax guide](docs/syntax/roles-and-directives.md) for further information.

- The **`dmath_double_inline`** configuration option allows display math (i.e. `$$`) within an inline context.
See [the math syntax guide](docs/syntax/optional.mdmath-shortcuts) for further information.

Remove v0.13 deprecations ‼️

The deprecations made to extension configurations and colon fences in `0.13.0` (see below) have now been removed:

- Configuration variables: `myst_admonition_enable`, `myst_figure_enable`, `myst_dmath_enable`, `myst_amsmath_enable`, `myst_deflist_enable`, `myst_html_img_enable`
- `:::{admonition,class}` -> `:::{admonition}\n:class: class`
- `:::{figure}` -> `:::{figure-md}`

Fix extraction of nested footnotes 🐛

Previously footnote definitions in block elements like lists would crash the parsing:

markdown
- [^e]: footnote definition in a block element


These are now correctly extracted.

1.0.0

This changes absolutely nothing in the code, or about the maintenance/release policy of this project.
But it does feel about time 😄

0.19.2

✨ NEW: Add myst_fence_as_directive config (<gh-pr:742>)

Setting the following config, for example:

python
extensions = ["myst_parser", "sphinxcontrib.mermaid"]
myst_fence_as_directive = ["mermaid"]
optional to use directive options
myst_enable_extensions = ["attrs_block"]


allows for one to write:

`markdown
{caption="My caption"}
{alt="HTML alt" align=center}
mermaid
graph LR
a --> b

`

and have interoperable rendering with tools like GitHub.

🎉 New contributors:

- 📚 Add `html_last_updated_fmt = ""` to conf.py to fix documentation footer, thanks to <gh-user:jeanas> (<gh-pr:691>)
- 📚 Fix the sphinx-design example, thanks to <gh-user:recfab> (<gh-pr:738>)

0.19.1

🐛 FIX `NoURI` error in doc reference resolution, for texinfo builds (<gh-pr:734>)

0.19.0

This release brings a number of exciting new features, improvements, and upgrades 🎉

Full Changelog: [v0.18.1...v0.19.0](https://github.com/executablebooks/MyST-Parser/compare/v0.18.1...v0.19.0)

📚 Rewritten documentation

The documentation has been almost completely rewritten,
with a clearer structure, many more examples, rich hover tips, and a new live preview page ⚡️ (powered by [pyscript](https://pyscript.readthedocs.io/), <gh-pr:717>).

The code base API is also now fully documented by [sphinx-autodoc2](https://sphinx-autodoc2.readthedocs.io/), which even allows for MyST docstrings! (<gh-pr:704>).

⬆️ Add Sphinx 6 support, drop Sphinx 4

The code base has been updated to support sphinx v6, and is no longer tested against sphinx v4 (<gh-pr:664>)

📄 Extended docutils (single-page) support

The `docutils` parser now supports many more features, and improvements to support live previews:

- `myst_suppress_warnings` option added, mirroring Sphinx, to suppress MyST warnings (<gh-pr:655>)
- `myst_meta_html` and `myst_substitutions` options are now supported (<gh-pr:672>)
- `myst_heading_anchors` option is now supported (<gh-pr:678>)
- Math block labels syntax is now supported (<gh-pr:668>)
- Missing directive/role errors errors are now suppressable warnings (<gh-pr:687>)
- Non-fatal directive parsing errors are now suppressable warnings (<gh-pr:682>)
- Most of the extended markdown syntax below is also supported

🔗 Extended Markdown links

See the [Extended Markdown links](docs/syntax/cross-referencing.md) section for the full guide.

You can now use standard Markdown link syntax to reference many different types of targets, in a more consistent way.

- `[text](relative/path/myfile.md)` work as previously, to link to files,
but they can also be relative to source directory: `[text](/path/from/srcdir/myfile.md)`.
You can also use `<project:file.md>`
- `<path:myfile.txt>` will link specifically to a downloadable file
- `[text](target)` or `<project:target>` will link (in order of priority) to any local target, local heading anchor, target in the same project, or intersphinx (inventory) target
- `[text](inv:name:domain:typetarget)` will link specifically to a Sphinx inventory target, or to any inventory `<inv:target>`, and can even use `*` wildcards like `<inv:*:*:**.target>`
- This can even be used in docutils, with the new `myst_inventories` config option
- The `myst-inv` CLI makes it easy to find the correct inventory target

:::{tip}
It is advised (although not immediately necessary) to prefix all internal references with ``.
For example, `[...](my-reference)`, should be changed to `[...](my-reference)`.
:::

`{}` Attributes syntax

The [`attrs_inline` and `attrs_block`](docs/syntax/optional.mdattributes) extensions allow for common Markdown syntaxes to be extended with greater control over the output.

For example, you can now add classes, ids, and other attributes to inline code, images, and links, as well as to code blocks and directives.

- Inline code: `` `a = 1`{id .class l=python} ``
- Images: `![image](image.png){id .class width=100px}`
- Text spans: `[some text]{id .class}`

A paragraph block can have attributes too:

markdown
{id .class}
This is a paragraph with an id and class


A code fence can be given line numbers and line emphasis:

`markdown
{id .class lineno-start=1 emphasize-lines="2,3"}
python
a = 1
b = 2
c = 3

`

A definition list can be turned into a glossary, with referenceable terms:

markdown
{.glossary}
term name
: Definition of the term


Quote blocks can be given an attribution:

markdown
{attribution="Chris Sewell"}
> My quote


👌 Miscellaneous improvements

- Nested headings (e.g. inside directives) are now allowed in MyST and are correctly rendered in HTML (<gh-pr:711>)
- The `colon_fence` extension now renders internal content as MyST, rather than as a code block (<gh-pr:713>)
- The `include` directive in MyST documents now supports a `:heading-offset:` option, to offset the heading levels in the included document
- The `myst_heading_slug_func` option now supports setting a `str` which points to a fully qualified function name, e.g. `"module.path.func"` (<gh-pr:696>)
- The `myst_enable_checkboxes` option allows for task list checkboxes to be enabled/disabled (<gh-pr:686>)

Additional contributions

- 🐛 FIX: Remove unnecessary assert in <gh-pr:659>, thanks to <gh-user:n-peugnet>
- 🔧 ci(deps): setup dependabot (<gh-pr:669>), thanks to <gh-user:mmorel-35>
- 🔧: Depend on typing_extensions only on `Python<3.8` in <gh-pr:642>, thanks to <gh-user:hukkin>

0.18.1

Full Changelog: [v0.18.0...v0.18.1](https://github.com/executablebooks/MyST-Parser/compare/v0.18.0...v0.18.1)

- ⬆️ UPGRADE: docutils 0.19 support in <gh-pr:611>
- ✨ NEW: Add `attrs_image` (experimental) extension in <gh-pr:620>
- e.g. `![image](image.png){id .class width=100px}`
- See: [Optional syntax section](docs/syntax/optional.md)
- **Important**: This is an experimental extension, and may change in future releases

Links

• PyPI: https://pypi.org/project/myst-parser
• Changelog: https://pyup.io/changelogs/myst-parser/

[pyup-bot]

Closing this in favor of #282