docker-compose troubleshooting

[mlangbehn]

Issue description

While working on #26, I ran into trouble with docker-compose. We have no troubleshooting section of our documentation to help users is such cases.

Request

Add basic trouble shooting information.

[mlangbehn]

Brief list of steps I followed

1. Run per docs
2. When unable to load localhost:30080, try nc or nmap
3. Run on different system
4. Repeat steps
5. Check firewall
6. Port scan locally and remote