[BUG] Properly handle `webp` files

[tycrek]

Is there an existing Issue for this bug?

• [X] I have searched the existing issues

Expected behavior

Webp images aren't handled the same way as most images. All the libraries ass use don't allow processing them.

Right now there's some temporary fixes in the code but for long-term support, this should be dealt with properly.

Actual behavior

Without the temporary fixes, uploads fails as things like thumbnail generation fail to handle Webp.

Steps to reproduce

Use 0.9.1 latest release (not master) and try uploading a webp file

Logs (optional)

Irrelevant since I know what to do with these

ass version

0.9.1

Deployment

Docker

File storage

Local

Operating system

Ubunutu/Windows

Node version

14.17

Storage method

Papito

Reverse proxy

• [X] I am using a reverse proxy

Reverse proxy software

Caddy

Cloudflare

• [ ] I am using Cloudflare