The margin-bottom of the last paragraphs was removed to make white space
at the end of the page same as on the top and sides.
Content images are now embedded in paragrapsh to ensure correct spacing
and use a class instead of an id, because there aren't unique.
Removed css rules for ul and li elements, which the project no longer
contains.
Navbar objects in app.py should only contain information needs to be
accessed from all tabs. This includes urls and page titles, but not
header pictures of individual tabs.
Navbar items are now passed as a dictionary to the templating engine.
Route definition now makes use of Flask's converters.
Removed unecessary references to super-blocks from layout.html children.
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