News: add a per-post setting "noquote"

News items that are quotes / stories look OK with "" in the summary view, but there are some items where it looks weird: for instance, when job postings are marked "closed".

Add a "noquote" data member to posts, so that individual posts can change the look in the overview. Apply it to the short overview on the front page -- doing this in the news page requires changes in a different repo.