Merge branch 'main' of git.adrian.geek.nz:/srv/git/haskell-stylist into main

Remove Stylist-Traits APIs from Stylist Core, leaving backwards-compatible stubs.

Improve documentation, release version 1.2

Improve code cleanliness to avoid future bugs.

Fix parser freezes, blocking issue for Rhapsode.

Switch to new namespace for consistency with other modules like css-syntax.

Draft alternate API.