[MAINT] Use prettier to format HTML and CSS

[Remi-Gau]

• Closes none but related to [DOC] display all masker reports in the doc #4295 (comment)

Changes proposed in this pull request:

• add prettier hook to pre-commit config
• run the hook on the code and doc base
• add github action to check formating

[github-actions]

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[Remi-Gau]

This is just a preview to see how much auto-formatting of the HTML and CSS can be done.

[Remi-Gau]

If we agree this is a good idea to have:

• mention it in the doc style guide section
• update README description CI actions

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.94%. Comparing base (abb80ff) to head (c2af15b).
Report is 28 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4302      +/-   ##
==========================================
+ Coverage   91.85%   91.94%   +0.08%     
==========================================
  Files         144      143       -1     
  Lines       16419    16452      +33     
  Branches     3434     3451      +17     
==========================================
+ Hits        15082    15126      +44     
+ Misses        792      780      -12     
- Partials      545      546       +1     

Flag	Coverage Δ
macos-latest_3.10_test_plotting	91.92% <ø> (?)
macos-latest_3.11_test_plotting	?
ubuntu-latest_3.10_test_plotting	?
ubuntu-latest_3.12_test_pre	91.92% <ø> (?)
windows-latest_3.8_test_plotting	91.86% <ø> (?)

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[Remi-Gau]

numpy2 issue is unrelated: see #4309

other tests should be fixed by #4306

[bthirion]

I'd be in favor of merging #4306 and #4309 first.
But, again, I'd like to see the reports generated...

[Remi-Gau]

I'd be in favor of merging #4306 and #4309 first. But, again, I'd like to see the reports generated...

• Will work on numpy 2 test workflow failures #4309 and ask for a full build once [DOC] display all masker reports in the doc #4295 is merged

[Remi-Gau]

For review

Before (current dev doc)

• GLM reports: https://nilearn.github.io/dev/modules/generated_reports/glm_reports_examples.html
• maskers reports: https://nilearn.github.io/dev/modules/generated_reports/masker_reports_examples.html

After

• GLM reports: https://output.circle-artifacts.com/output/job/cfcee469-6141-46e7-a4f7-72e0ba71f6af/artifacts/0/dev/modules/generated_reports/glm_reports_examples.html
• maskers reports: https://output.circle-artifacts.com/output/job/cfcee469-6141-46e7-a4f7-72e0ba71f6af/artifacts/0/dev/modules/generated_reports/masker_reports_examples.html

[bthirion]

LGTM. Certainly deserves a whatwnew entry.

[Remi-Gau]

LGTM. Certainly deserves a whatwnew entry.

That's fair.

Will fix the merge conflicts and update the changelog.