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>
This change removes the background image (which is the small version of the uploaded image) from the lightbox backdrop.
Now a solid color (dark grey) is used for the backdrop so we can distinguish between the lightbox's head, body and footer.
Fixes issue with scrolling background when lightbox is opened on mobile.
Since we rely on swiping for navigating lightbox galleries on mobile, we want to disable document scrolling.
