Web-based editing

[eevee]

I think this is going to be really really really important, because we suck at writing prose but it's a pain for any non-programmers to contribute to our prose.

Stuff that needs to be editable:

• Effect prose
• Walkthrough content on place pages
• Full-page articles (mechanics!)
• Competitive commentary on Pokémon, moves, abilities, if we ever do that sort of thing

Requirements:

• Only a fixed small number of people; not a wiki
• Only accessible via the beta
• Changes viewable live (otherwise what's the point)
• Some kind of log so we can see who changed what and approve it and get it pushed back to the repo