[stable13] theming: handle not being in the serverroot #8554
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This PR is a backport of #8463 for v13.
Currently, the theming app assumes it's in the serverroot. However, with Nextcloud's flexibility regarding configurable app paths, this is not a safe assumption to make. If it happens to be an incorrect assumption, the theming app fails to work.
Instead of relying on the serverroot, just use the path from the AppManager and utilize relative paths for assets from there.