Use monospace fonts for code

The theme ships with Proxima Nova for code, but they should be
monospaced.

Change-Id: I68d0efbb029e7d8ac5517e75da534b2d364274c8
Reviewed-on: https://gerrit.causes.com/23038
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Joe Lencioni <joe.lencioni@causes.com>
Remove greyshade css file

Change-Id: I2f7cc0c2036118b32b4cb1f7509af612984c0939
Reviewed-on: https://gerrit.causes.com/23040
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Joe Lencioni <joe.lencioni@causes.com>
Remove FancyBox and Disqus

We don't want/need these plugins.

Change-Id: I87bedcff21f4f68b99337d32591109aafced4763
Reviewed-on: https://gerrit.causes.com/23041
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Joe Lencioni <joe.lencioni@causes.com>