fix: 🐛 serve the asserts from nginx instead of starlette
Starlette cannot serve ranges for static files, see
https://github.com/encode/starlette/issues/950.

Also: fix the rights of the assets directory
Also: add the CORS header (doc)
fix: 🐛 serve the asserts from nginx instead of starlette: Starlette cannot serve ranges for static files, see
https://github.com/encode/starlette/issues/950.

Also: fix the rights of the assets directory
Also: add the CORS header (doc)