[Meta] Amsterdam gdo documentation sprint

Problem/Motivation

Picking up from our work in Austin earlier this year (#2278109: Documentation sprint? (and request for existing documentation)) on improving documentation for group managers. Previously a lot of this documentation was scattered around; in Austin we gathered most of it together. There is still new documentation that needs to be created, and the "about" and "how-to" pages for group managers could be improved.

Also see Google Doc with notes from today (which could go beyond just documentation issues): http://bit.ly/gdo-ams

Remaining tasks

#1482908: Revise about page content

#2278657: Update, clarify and restructure the g.d.o documentation section

#2278633: Document how to use the "river of news" view on a replaced home page

#2278635: How to create an iCal feed for events

#2278637: How to create or edit the RSS feed for a group

#2346621: Update and organize 'Guidelines for Creating New Drupal Groups'

#2346717: Document how to create a calendar block in a group

#2346823: Get new group organizers EXCITED!