JBIDE-16309: Listing URLs of component sites

This removes the profiles "jbosstools-site", "jbosstools-nightly-staging-composite"
and "jbosstools-staging-aggregate" and removes default reference
between JBT components in parent pom.
So component poms must reference other components without
having to maintain the URL and its various parameters.

The benefit is that we avoid cycles and have better control over
inter-component dependencies.
This also provide more independence to components.