Add publications to the website.

The publications page is fed by
python/firedrake_docs/source/_static/bibliography.bib. Adding
references to that file and republishing the website will update the
bibliography.
Add a photo of Michael Lange
Graham's studentship
Add Simon and reduce David's head size!
Include instructions for installing cgen in the download instructions.
An important missign colon.
Youtube video.
Remove unused featured slides carousel
Set sidebar width to auto
Remove jQuery from CDN since sphinx always includes it
Query GitHub API for latest commit instead of showing RSS feed
Some styling for the latest commit on front page
Update sidebar heading to better reflect content
Add links to GitHub and Travis in navigation bar
Show list of 10 most recent commits without message
Make the number of commits to show configurable
Mark even rows with the even class
Some more CSS styling, hide avatar images
Only show latest 5 commits
No more finite element stimulation