Add styles to global.scss to make Magnolia & Jive consistent with Developer

- also remove the “http:” from static url’s to avoid issues with
“https:”
@pmuir this file has already being in production for the last month or so --> https://static.jboss.org/ffe/16.0.0/css/global.css.  Rysiek had helped me change those urls to avoid an issue with "https:" not working.  If the links work now, then it's totally fine to change them back to "cdn()"  :-)