[enhancement] Add library support other media types

[bcurran3]

Is your feature request related to a problem? Please describe.
No

Describe the solution you'd like
Other common and not so common media that people self-hoard self-host that would be nice to see supported:

• audiobooks (easy to implement as it's the same as music)
• ebooks (pdf, epub, azw3, mobi, etc)
• comics (arguably the same as ebooks (cbr, cbz, pdf)
• photos (jpg, png, avif, tiff, gif, raw, webp, bmp, heic, svg, cr2, nef, etc.)
• ROMs (n64, z64, adf, a26, nes, rom, wad, wbfs, iso, etc)

Describe alternatives you've considered

Additional context
Not as popular as A/V, but useful.

[frederikemmer]

Audiobooks are already supported (You are absolutely welcome to suggest improvements here as it's pretty basic for the moment :).

other formats are in planning in descending priority:

• photos
• ebooks/comics

I didn't think about ROMs for now, but maybe something to consider...