In which we make restructuring amendments and remove the pernicious influence of backend templating

Some amendments I'd like to be included in https://github.com/freedomgames/Planet-Lab/pull/27 -- see some of my comments in there for context.

* Collapse everything into frontend/app, no more bifurcation between frontend/static and frontend/template
* Remove all backend templating 
* Update relevant docs

@maiamcguinness