- switch to napi-rs. this mostly affects only the backend side of things, but IMO napi-rs is better (also, way less boilerplate is needed compared to neon).
- jpeg encoding no longer clones the input buffer internally (or wraps it in a Mutex as well), thanks to napi-rs not sucking in this regard. this is *probably* a micro-optimization, but will make it easier to later on do parallel encoding of all rectangles
- guac encoding is weird. This is kind of a painpoint of napi-rs but it's bearable
doesn't really need to be two seperate libraries. also preperation for other funnies
the build script has been replaced with a much saner justfile which uses much saner "yarn workspace" invocations instead of blindly cding all over the place
