Advanced configuration documentation fixes
I encountered these issues when setting up Mobilizon for first time:
- Explain what are SMTP_SERVER and SMTP_HOSTNAME
- docker cp doesn't know about the mobilizon container at this phase, as it hasn't been started ever. Explain it must be started at least once before running this command.
- Container name is wrong. Working command is: docker cp docker-mobilizon_mobilizon_1:/etc/mobilizon/config.exs .
- Explain that the oauth config must be added to config.exs, not to some other file the ueberauth docs may point to.
Otherwise docs are quite easy to follow. Merci!