A handful of changes!

I've made the navigation bar appear on every page with:
<?php echo file_get_contents('navbar.html'); ?>
I've deleted all the old pages with that horrible navigation bar, so we
can recreate them with the new bar. The PHP script above fetches the
navbar.html file and places it on the page. Because it is PHP, the file
also needs to be PHP. You cannot load a PHP file from your computer
locally without having PHP installed, so to see it in action go to:
learningscratch.gwiddle.org/alphaDev/about.php. Looking at the source
code of that webpage, it looks like it like it was before, but that PHP
script is actually taking the navbar.html code and placing it in
about.php. Because it will be hard to see the preview of what we make
without PHP installed on our PCs, leave out that PHP script until the
webpage is finished. I shall then add the script and change the file
type. I also had a go at making the theme appear on about.php too. I
made it's HTML refer to main.css, but it has had a few side effects,
like off-centered text and that. That's about it really. Thanks!