[WIP] Sphinx example gallery

[tpvasconcelos]

Description

Related issues

#88

PR check list

• Read the contributing guidelines.
  • You don't have to read the whole thing, but it's a good idea to skim it. And definitely take a look at it if you're experiencing any issues getting your local environment up and running.
• Provided the relevant details in the PR's description.
• Referenced relevant issues in the PR's description.
• Added tests for all my changes.
  • The CI will fail unless 100% of all new code is covered by the tests.
• Updated the docs for relevant changes.
  • New modules (or renamed ones) are included in docs/api/internal/.
  • New public functions/classes/variables are documented in docs/api/index.rst.
  • Added the appropriate versionadded, versionchanged, or deprecated directives to docstrings.
    • The version should be the next release version, which you can infer by bumping the minor version in MAJOR.MINOR.PATCH (e.g., if the current version is 0.2.3, the next release will be 0.3.0).
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📚 Documentation preview 📚: https://ridgeplot--267.org.readthedocs.build/en/267/

[github-actions]

⚠️ Missing changelog entry ⚠️

Please add an entry to the changelog in docs/reference/changelog.md for this PR.
The entry should be in the following format:

- Description of the change ({gh-pr}`267`)

If you don't think a changelog entry is necessary for this change, you can add a skip news label to this PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (fdf0c6d) to head (16172bf).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #267   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           18        18           
  Lines          649       649           
  Branches        78        78           
=========================================
  Hits           649       649           

Flag	Coverage Δ
combined-src	99.84% <ø> (ø)

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[tpvasconcelos]

Let's wait for sphinx-gallery/sphinx-gallery#1398 (sphinx-gallery/sphinx-gallery#1397) to be merged and released