Merge branch 'development' into frontend
Major changes to site navigation

Implemented vertical navigation style. Navigation is now located to the
left hand side of the window and is present on all pages. Should allow
for higher user engagement and usability as links are clearer.
Small changes to nav bar styling
Navigation bar is now scrollable on in small windows
Structured the layout of the data pages.

Placed data into lists - displayed in a table like view
Added a function to allow the app to display herds

Herds are displayed in the sidebar and are found from the doc currently
being searched for. This causes problems as the docs for all cattle and
medicine, for example, will be different - thus providing different
values for the list of herds.
Added a very basic notification system

Notifications are displayed in the sidebar of every page. They can be
added to the user schema using a simple post request.
Restructured the herd searching.

Herds are added by users in the sidebar and can be clicked to lead to a
list of cows within that herd.
Added cattle sorting b ascending and descending order
Added Lato font family to nav.css
Merge branch 'frontend' into development