Reliable user info; Font refactor

Hit a few more endpoints to fix missing images, fallback to default album art just in case.

Refactor the font cache into its own file.

Clippy

Cleanup

Custom font support complete

Add custom font support.

Remove redundant HTML escaping helpers.

fix typo in plain theme breaking light mode.

Create plain theme, do some escaping, fix some busted envvars, document themes.

lots of stuff. theming basically done, added some logging, frontend basically done.

pull down user info

config done

fix packages, implement caching

API deserialization structs