story #7290: be able to add custom tours on my forge

This is a rebase of all the commits for this story into a single commit

Change-Id: I1531201ee01d54131ea88aec2887e83e63dcfd41
Merge commit 'refs/changes/92/2892/2' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  story #7290: be able to add custom tours on my forge

Change-Id: Ia52fab72854033c9f8e8752e0aeec8c158494692
This is Tuleap 7.3.99.54

Change-Id: Ib25d5bdbb0bd60b0f4f157a4c49526169333b005