Properly load fonts

[juliushaertl]

Still WIP but properly sets the base URL now.

The issue was that excalidraw was already loading the fonts on the import of App, delaying that until we actually want to render with a dynamic import is a good idea anyways since that way we can keep the bundle size initially loaded small

Currently requires manualy copying:

cp -r node_modules/@excalidraw/excalidraw/dist/excalidraw-assets dist/

• [x] See if we can let vite copy the font files automatically during build