Shortcut URLs for featured groups

[hypeJunction]

Since we only have 10+ featured groups with quite distinct names, we could perhaps give them their own page handler, i.e. community.elgg.org/feedback-and-planning.

[brettp]

Like the idea, but it'd lock us into those routes for anyone who has bookmarked them.

[ewinslow]

this seems closely related to that one ticket about giving groups usernames. For example,

community.elgg.org/groups/feedback

[hypeJunction]

We could maintain both by using 'route' hooks