Remove old test reports

There is little to no utility carrying the 2+ year old weekly test
reports. Newer test reports are now reported on:

   https://lavaphabbridge.apertis.org/



The reports add siginficant bloat to the website and therefore to the
search file. Remove the reports and clean up any links to them.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>