cleanup HEAD section

The HEAD area used a lot of hardcoded values... for example, creating styles based upon this theme was imposible due to the hardcoded style.css reference. The hardcoded base href without a trailing slash broke IE's rendering of the page. The language was hardcoded to "en".

Patch attached.

BTW: Isn't it wrong to specify image/png as the type for an .ico file? (the favicon) That should probably be changed to image/x-icon.