Showcase and updates blog

We currently use Django for our blog (https://www.ocf.berkeley.edu/announcements/), but adding new posts is an annoying process that is prone to error and poorly documented. We should use a static site generator for this blog, and actually post to it!

This site could also perhaps use design cues from the new style guide. It would also be nice to backport our old posts to this new blog and redirect the old URLs on the Django side.

Also see Showcase Blog Post Ideas for brainstorming things to blog about.