To find main url in header section, search link containing:
- load.php
- or opensearch_desc.php

In Wikipedia or wiki.documentfoundation.org, I haven't seen any link with index.php

Change-Id: Iccb27aa8aaaf936faf8ec3b3f67eaa98d0426f19
Reviewed-on: https://gerrit.libreoffice.org/38631Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
(cherry picked from commit e34b0283)
Reviewed-on: https://gerrit.libreoffice.org/38646
(cherry picked from commit c51e789b)