[#19] Adds some basic navigation functionality

This commit has the following issues:
Links are not done to the application format - please advise
The navigation could be in a template block instead of base.html -
please advise
Logout needs more thought as to how that is handled
[#19] Adds some more dummy links to the page navigation
Merge pull request #22 from caprenter/19-page-navigation-ui

[#19] Adds some basic navigation functionality