prettify the "all events feed" banner #802
Description
as per this from @carrythebanner re: the new all events feed.
Could also add the cal feed banner to the /calgrid page, and could probably hide it on individual ride listings...
With 2 promo banners stacked there's a bit much in terms of top matter, but we'll be hiding the PP promo banner in 2 days so that's a non-issue IMO.
the feed info is hidden from single events:
but we could add it to the calgrid, and we should figure out how to make it play nicer with the pedalp banner.
( some possible ideas: maybe move it to the bottom, merge it with the "safe for all" section, maybe add info about the bikefun app? )
