Images must not exceed 10MB on upload

[sr229]

Since we're moving to a new kind of IPFS pinning service, we're going to relax the initial ratelimits by just enforcing size limits to prevent abuse. Starting from now on we're going to limit the images to be 10MB or less, this is also to lessen the strain on the convert function (as one function only has 512MB memory in Vercel) and they would be even smaller on upload as we will convert them to WebP directly while maintaining their resolution.