Update scripts that build HTML from Markdown to use stylesheets in new location

Stylesheets are no longer served up by GitHub. They were moved to jboss.org for a while, but disappeared when the site was revamped. They have now been added to a new location here: http://static.jboss.org/ffe/0/www/vendor/redhat/

I updated the JBoss EAP and WFK quickstart scripts, but am unclear how you are generating your HTML in this repository. If you do not want to merge this pull, feel free to steal what you need!