move the web dashboard from config tree into elastic recheck and
make it installable into $prefix/share. Documentation on the expected
way this would work is provided in the web sub tree.
Also ensure that we actually fetch from /elastic-recheck/data as we
expect people to set things up.
Change-Id: I514b6cf2c18bb4d570f830d78e87e713b9c3531e
Sean Dague