[feature] Add global instance CSS customization setting (#3352)

Allow instance admins to add custom CSS that will affect
every page of their instance.

This is done with a new CustomCSS instance setting that
works pretty much exactly like the Users CustomCSS property.
This custom CSS is then requested for every page load.
User styles/themes take precedence over this CSS.

Co-authored-by: tobi <tobi.smethurst@protonmail.com>
This commit is contained in:
Victor Dyotte 2024-12-02 06:24:48 -05:00 committed by GitHub
commit 9609c4550d
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25 changed files with 158 additions and 27 deletions

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