Participation documentation

[DavidMann10k]

We should have more documentation on how people can participate in the creation and maintenance of this website. There are two ways we should have more documentation on.

1. Github as a CMS. Creating event and maybe other kinds of ducuments through the github interface.
2. Local Jekyll development. For advanced users. Pulling the repo, branching code, developing and running the software locally, and opening pull requests.

[mgrider]

I agree with something you said elsewhere, that the advanced users can probably figure this stuff out on their own. We should focus on getting inexperienced folks started. (Could also be for local development w/ Jekyll.)

I also think there's a 3rd category, documentation that is more content focused. What kinds of content do we have, and how to add them. What are the standards & naming conventions for that content, etc..