[HOLD][#53420683] Adds a page detailing the process of setting up group registration.

Requires https://github.com/AllPlayers/brochure.allplayers.com/pull/154.


![1](https://f.cloud.github.com/assets/2251119/1624650/f4a011b2-56c5-11e3-96f0-afd00c15b7b5.png)


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