Nicer web demo

[JolifantoBambla]

Add a model loader (maybe https://github.com/kovacsv/assimpjs)

Provide some preprocessed models but get rid of the silly js file thing. Should probably host them somewhere else s.t. they aren't part of the repo when downloaded via (e.g.) cpm
Esp. get rid of lfs stuff

[JolifantoBambla]

Also: the lod selection metric needs to be fixed

[JolifantoBambla]

Depends on #7

[JolifantoBambla]

added processing in the browser

should fix initial loading time at some point

[JolifantoBambla]

That's more or less done - error metric still needs some tuning. The approximate screen size is not correct so the threshold currently needs to be set differently for each model