BACE: Suggest a new category link

[LRenery]

Screenshot coming soon -- this may be a parking lot issue, but we would like a link on the Requests, Offers, and sign up screens (i.e. wherever categories are exposed) that says "Want to suggest a new category?" and clicking it should spawn an email to the BACE admin (maybe there's already a generic email - or to Carl?) with "New Category Suggestion" in its subject line.

I don't think we need anything analogous for Neighborhoods.