Collection permalinks

[sawyerh]

This is nitpicky, but now that we have a closer idea of the documentation structure, can we simplify some of the collection's permalinks:

• [x] users-and-settings -> sites (this is the one that bugs me the most)
• [x] siteleaf-v2 -> v2
• [x] managing-content -> content
• [x] theme-development -> themes

You'll want to do a find-and-replace to make sure any inline links are also updated.

[ethnt]

Reopening this. I don't think we can change managing-content to content: I think content maybe a reserved word in Jekyll.

[ethnt]

Never mind, I'm an idiot — renamed the _managing-content/ directory to content/ instead of _content/.