Thanks to @erkkah.
- Implements local image handling functionality.
- Fix a bug that blocked the use of Markdown references.
- Breaking change: Switch from markdown-it-highlight to markdown-it-highlightjs, since the first seems to be abandoned.
- Bump dependencies to fix dependencies vulnerabilities.
- Bump dependencies to fix dependencies vulnerabilities.
- Bump dependencies, there is a vulnerability in serialize-to-js dependency: https://github.com/advisories/GHSA-3fjq-93xj-3f3f.
- Add highlight support when 'markdown-it-highlight' is available.