Update README run locally section

Running `uv run uvicorn src.main --host 0.0.0.0 --port 8080` yields the following error: ` Error loading ASGI app. Import string "src.main" must be in format "<module>:<attribute>".`

This should probably be updated to something along the lines of: `uv run uvicorn src.main:app --host 0.0.0.0 --port 8080` to start the server