Update live site with new blog post, some features and touchups

This deploys the following overall things to the live site:

* An RSS feed!
* Added post tags, publish dates, and restyled post title area.
* Added `/robots.txt`.
* Added @LindsayYoung and @dlapiduz to team pics. Add @avriette to the team list but without a photo.
* Juggle blog assets directory structure around to move pictures into `/assets/blog`.
* New blog post by @cscairns, @meiqimichelle and @nickbristow -- our first one published in Markdown in our new blogging system.