This feature was originally authored by @sweetppro in PR #438.
However, since the PR ended up in an unclean state with
multiple master merges (instead of rebase) from the upstream, there are
several commits that are out of order and can can no longer be be
squashed for a clean feature merge.
This commit aggregates the changes from the original PR and applies the
following fixes on top of it.
- Add custom admin JS box to appearance UI.
- Refactor i18n language strings.
- Add handlers and migrations for the new `appearance.admin.custom_js`
field.
- Fix migration version to `v2.1.0`
- Load custom appearance CSS/JS bytes into global constants during boot
instead of making a DB call on every request.
- Fix and canonicalize URIs from `/api/custom*` to `/public/*.css`
and `/admin/*.css`. Add proxy paths to yarn proxy config.
- Remove redundant HTTP handlers for different custom appearance files
and refactor into a single handler `serveCustomApperance()`
- Fix content-type and UTF8 encoding headers for different file types.
- Fix incorrect registration of public facing custom CSS/JS handlers
in the authenticated admin URI group.
- Fix merge conflicts in `Settings.vue`.
- Minor HTML and style fixes.
- Remove the `AppearanceEditor` component and use the existing
`HTMLEditor` component instead.
- Add `language` prop to the `HTMLEditor` component.
Co-authored-by: SweetPPro <sweetppro@users.noreply.github.com>
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