Adjust content in the Tutorial, Examples, and Recipes sections

[klywang]

Issue Description

These sections use nearly identical examples. The main difference is the Tutorial section includes more description, while the Examples section condensed the scripts from the tutorials.

We'd like to open a discussion on the aim of each section and use these aims to improve the Tutorial and Examples sections.

Proposed change

TBD

[klywang]

The aims of the Tutorial, Examples, and Recipies sections are detailed below, according to discussion between @atravitz, @b-butler, @bdice, and @vyasr:

• Tutorial
  • Explanations of concepts between code snippets
  • More verbose than Examples
• Examples
  • Clear, concise code
  • Self contained
  • May include external packages
  • Templates for more advanced usage of signac rather than instructional
• Recipes
  • How to guides
  • Includes copy/paste components of code for advanced usages of signac

Proposed Changes

• Tutorial
  • Ensure Tutorial covers all necessary concepts included in the ideal gas code from Examples
• Examples
  • Remove the ideal gas example from Examples
  • Add direct links to signac-examples repo, links should accompany explanations for the purpose of each example
  • Create git submodules of examples

[bdice]

Just to clarify: all current content in Examples should be removed, not just the ideal gas. This will be replaced with content from signac-examples.

• The HOOMD MD example should be replaced with its equivalent code in signac-examples
• The Sacred example should be changed to a recipe.