Because all pages are complete pages that can be viewed with or without
javascript, the 'init' and 'loading-error' classes should not be set on
the '#page-content' div. Similarly the 'loading' class should not be set
on '#nav'. All associated logic and css for the 'init' and 'loading'
classes is also unused. This commit removes the aforementioned.
Signed-off-by: Collin J. Doering <collin.doering@rekahsoft.ca>