Release 8.1.0

Improvements

• Allow CSS variables to be used as values in the Color trait by @nurbo in #3796
• Replace ipykernel dependency by the comm dependency by @martinRenou in #3811

Documentation

• Fix link to "Output widget examples" by @warrickball in #3801
• docs: remove developer docs resources by @emmanuel-ferdman in #3800
• Add missing close bracket in index.md by @warrickball in #3799
• Docs: Remove the note about mappings not working with selection widgets. by @ferdnyc in #3793

Maintenance

• Binder and yarn tweaks by @ferdnyc in #3795
• Remove shebang lines from test_* files by @frenzymadness in #3807

New Contributors

• @warrickball made their first contribution in #3801
• @emmanuel-ferdman made their first contribution in #3800
• @nurbo made their first contribution in #3796

Full Changelog: 8.0.7...8.1.0