fix a few more bad links
tweak the main nav links a little
fixes #1676 so we can more easily build aggregated zips using just the "fabric8:zip" goal easily without hitting horrid issues with the mojo aggregator causing unnecessary build forking etc
#1676 lets remove the old fabric8:aggregate-zip goal as the mojo aggregator caused unnecessary build forking; now we can just use 'fabric8:zip' in a root project instead