Reign in the proliferation of custom Helvetica Font Families [#64494940]

https://www.pivotaltracker.com/story/show/64494940
Pull out some more common theme elements into base. [#67032426]

https://www.pivotaltracker.com/story/show/67032426
remove unhelpful H2 tags.
Use cc-theme-template partial and mixin. [#67032426]

https://www.pivotaltracker.com/story/show/67032426
Apply theme changes to other curriculum modules.  [#66966544]

https://www.pivotaltracker.com/story/show/66966544