Ref #36.  Adapted the header pages to display titles only.  Also, rearranged the order on technicaldescription.rst, so that certification based replication would come second, (given that from the text this appears to be the intended order).
Ref #36: Added a hidden toctree on the gettingstarted.rst and replaced the original little toctree elements with manual link list.  Brought galerainstallation.rst back into the toctree, but bypassed it through the direct links on gettingstarted.rst, to keep the links on index.html clean.  Updated the page titles for the install*.rst pages for a cleaner display.