Putting nginx in front

STUB — page map only. This page exists so the sidebar and the shape of the site are judgeable; M6 writes it.

Must carry: a working server block, proxy_pass to 127.0.0.1:7700, the WebSocket upgrade headers, certbot, and — once TLS is in front — setting bind: 127.0.0.1 so port 7700 stops answering the internet directly.