Slight Arrangement Modifications

The arrangement of some elements was slightly modified in order to make
the page more visually appealing.
Navigation Bar Animation Threshold Changed

The scrolling threshold at which the navigation bar would fade in or
out has been changed so that it happens more quickly.
Prepared contact.html for customisation

The file about.html was prepared for customisation, broken links were
fixed and the code was cleaned up in general.

Certain blocks (e.g. the footer) were also removed.