Docs: setup friction

Here is a running list of friction encountered when setting up for the first time. The docs should be updated to address these items:

- [ ] uv installation
- [ ] is abs path to uv required?
- [ ] is uv from venv acceptable?
- [ ] errors when setting path to server/ dir in config
- [ ] certifi required for soar url
- [ ] bypassing uv and using `command": "/bin/bash",`
- [ ] server.py in 3 but scc_mcp.py in 1 (I've seen server.py used for SCC due to copy paste)
- [ ] inline env vars vs --env
- [ ] --env in wrong location (must be: `run --env-file "/Users/dandye/Projects/google-mcp-security/.env"`)
- [ ] ...