Go back over arXiv highlights posts and give them attractive titles

[danielpcox]

As previously discussed, I really should go back over all the arXiv highlights posts and give them much more attractive titles, possibly just swapping the summaries and titles as a first pass. Right now the titles are just "arXiv highlights Aug 25-31" or something like that, which is terrible. Each post is about something specific, and if I may say so myself, interesting, so the titles should reflect that.