not "recent" announcments anymore, just announcements.

"recent" and the "view all" text in the table header imply another
place where announcements can be managed on the site. but i don't want
to create an announcements management page, the whole point of this
being in the dashboard is to simplify management and creation of
announcements as much as possible. will adjust "recent-" in variable
names, HTML classes, etc. later.