ImageCFG and RNS-510 VIM posts.

Every page will now show the page's description under the site title
instead of the site's description. I think this is a better use of that
area instead of always showing the same thing.

Blanked site.url so I don't have to keep changing it every time I test
or when I start using a custom domain. It should work just fine but I
won't know 100% until I make this live.

Added link to UnofficialDDNS at the top navigation bar. I think this is
a good spot to put those kinds of links... for now.

Removed the demo post and added ImageCFG and RNS510. Also included their
respective file downloads.