Write the example config, including every current config option for every module

We will need to keep this file up to date every time we add a config option or change a default.

I wrote this specifically because Ashton wanted to play around with the server but there was no docs on the config options.
I kinda swayed back and forth on what kind of example config this should be, whether it should be a minimal config, or a recommended config. I chose the latter, which is why all these are activated. Good point about moving them though.
I felt a summary was more useful than a full description - this is meant to be a config file, not the entire project documentation (it suffers from being the **only** documentation right now).