Stylelint is a css linter: https://stylelint.io/
As part of this change we have added two javascript scripts:
```
pnpm lint:css
pnpm lint:css:fix
```
Look at `.vscode/settings.json.sample` and `.vscode/extensions.json` for
configuration in VSCode.
---------
Co-authored-by: Joffrey JAFFEUX <j.jaffeux@gmail.com>
* UX: More additions
* UX: more
* DEV: Add admin/config/themes route
* UX: Use admin config card
* syntax merge fixes
* cleanup
* cleanup
* checkbox
* more
* error
* save on click
* more
* fix setter
* DEV: Implement vanilla checkbox
* cleanup
* UX: save themes as default
* DEV: Add component list to card
* DEV: Add placeholder for no screenshots
* DEV: Fix default theme reactivity
Also add content/optionalAction yields to config area
card and put the theme user selectable checkbox there,
along with adding styles.
* DEV: Change to generic "look and feel" config area
* DEV: Auto redirect to themes on base look and feel route
* UX: Remove computed from sorted themes
* linting
* UX: Turn update icon into button that routes to settings
* DEV: remove unused function
* UX: center icons with title
* DEV: Lint
* UX: Hook up theme preview button
* DEV: Minor fixes
---------
Co-authored-by: Martin Brennan <martin@discourse.org>
Co-authored-by: Joffrey JAFFEUX <j.jaffeux@gmail.com>
