Build: move language colors into separate file

It will be added as an option on userstyles
Build: optimizing & removing selectors out of desparation
Revert "Build: optimizing & removing selectors out of desparation"

This reverts commit cca2d4598f804c5c14811f15b67609df23d18dba.
Revert "Build: move language colors into separate file"

This reverts commit ca2d5f5c83f7fcb7eb5ac2f964e479de58fb76b3.
Diffs: #181818 background
version bump
Merge branch 'master' into gh-pages