Started the tidy up.

I've added the navbar.html file back, because it somehow went missing.
I've also added a licence.html page, which shall be merged into every
webpage with the PHP script. There is no need to save the files as .php
as it is enabled on the server, however you won't be able to see it on
your computer, so don't think it's a bug. There is only one problem, and
that is that the logo won't align center.