Haproxy was renamed in [1].

[1] https://review.opendev.org/c/openstack/kolla-ansible/+/770618

Change-Id: Ib2d7f0774fede570a8c4c315d83afd420c31da0b

Change-Id: Id9a24c54db9a70c777e51ea10504159d5090f9a7

The variable was documented as database_username, but should be database_user.

Change-Id: Ia1fd8f9a9336c26520041fa2138c763a8c382bca

Closes-Bug: #1804850
Change-Id: Icb7edbac5df316af68972cafa448a261c26747b0

Change index to ease identify what service want to look.
Split docs into more specific folder such as networking
and storage.

Change-Id: Ic7ac12b3dd555fa5c018eeb897ccd4a5a2dfe8f3