Fix RSS link so bots can find it. Add Disqus comments if enabled.

Based upon 5d0fb9e7348537637ae0d1c9c98b73c427a32569 by the
amazing @evmcl.
Merge branch 'base' into build

* base:
  Fix RSS link so bots can find it. Add Disqus comments if enabled.

Conflicts:
	_layouts/default.html