Right. This seems like a good pattern to have. Much like app/framework specific config, I much prefer to have everything under ~/.local/ than a myriad of ~/.foo dotfiles. It's only one endpoint to route, and you don't need to change configs each time you add some new static file.

IMHO, index.html and favicon should be the only files living at top level, and I guess robots.txt since that's a de facto standard (and soon to be actual standard iirc)