feat: adding stylelint

[shaal]

Description

CSS structure is very different between components / projects. We should add stylelint (used by Drupal core - https://www.drupal.org/node/2868114) to organize CSS files.

@todo, we should rename the extension of all source CSS files to pcss.css, then it's easier to target these files (vs. compiled CSS file which would be .css.

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• [ ] Visual Testing
• [ ] Automated Testing
• [ ] Accessibility Testing

Checklist

• [ ] My code follows the style guidelines of this project
• [ ] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules

[changeset-bot[bot]]

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Latest commit: 9fae206474b32c092531572e008bdc4700e5971a

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[socket-security[bot]]

New dependency changes detected. Learn more about Socket for GitHub ↗︎

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👍 No new dependency issues detected in pull request

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Pull request alert summary

Issue	Status
Install scripts	✅ 0 issues
Native code	✅ 0 issues
Bin script shell injection	✅ 0 issues
Unresolved require	✅ 0 issues
Invalid package.json	✅ 0 issues
HTTP dependency	✅ 0 issues
Git dependency	✅ 0 issues
Potential typo squat	✅ 0 issues
Known Malware	✅ 0 issues
Telemetry	✅ 0 issues
Protestware/Troll package	✅ 0 issues

---

📊 Modified Dependency Overview:

➕ Added Package	Capability Access	+/- Transitive Count	Publisher
stylelint@15.6.2	filesystem, environment	+29	mattxwang
stylelint-config-standard@33.0.0	None	+31	ybiquitous
stylelint-checkstyle-formatter@0.1.2	None	+0	mhmadhamster
stylelint-order@6.0.3	None	+31	hudochenkov

[glitchgirl]

using prettier instead https://github.com/phase2/outline/pull/397