ensure the website urls for installing from central continues to work for both devstudio domains

with devstudio.jboss.com being replace by devstudio.redhat.com we need central to continue to understand both when url is dragged to it and we can't just hard code the use of redhat.com into the website since that will make the urls invalid for JBDS 7.

https://github.com/jbosstools/jbosstools-website/pull/197 and https://github.com/jbosstools/jbosstools-central/pull/281 are incomplete versions of this that hardcodes devstudio.redhat.com - we need to support both.