5.2.1

Mostly a documentation release to fix broken links and update references.

Fixes

• Fix Greek language tag to el — thanks @PhilippeVay
• Sourcemaps are now available for every CSS files
• Switched to :not() complex notation to reduce complex selectors a bit — thanks @zwiastunsw
• Moved to inset as shorthand for positions

Chore

• Dependencies update
• Webextension has been moved to its own repository
• Broken links are now check using link-checker, which handles anchors
• GitHub actions has been updated and enhanced

Expect a webextension release soon :)