Remove unused dependency PyMuPDF

[iiLaurens]

It seems Pymupdf is a dependency, but it's unused.

Pymupdf is problematic in a corporate environment because it is AGPL3 licensed. Some companies even blacklist these packages, preventing them from being installed.

Also the AGPL3 license is a strong copyleft license, so your library becomes tainted and forced to be AGPL3 licensed. Since it is not actually used I don't think you are technically in violation, but its something to be wary off if you intend to embed it in browsr.

[juftin]

We actually are using PyMuPDF but we're using its former name, fitz https://pymupdf.readthedocs.io/en/latest/tutorial.html#note-on-the-name-fitz

I will need to take a look at its licensing and see if there's an alternative, or get rid of it altogether

[iiLaurens]

If you are just using it to render, then Pdfium has a compatible license. PyPDFium2 is a good python implementation!