Add CreateTagService.  Use new service to allow tag creation through API.
Make sure the branch counter gets updated

When you delete a branch, the counters wont get updated automaticly,
this happends because of the JS nature of the original call. I've
fixed this by responding with a JS file, and recalculate the counters.

Fixes: #6030
Changed some stuff around after rebase
Update documentaiton for create_tag method.
Add tests for creating tag with API.
Fixup for HoundCI.
More fixup for HoundCI. Fix up some small issues in docs.
Update tags_controller.rb to use CreateTagService.
The hard limit should be a lot more liberal, 10x seems reasonable.
Omnibus instructions for re-adding indexes
Fix broken repositories_spec test for creating new tags.
Too many zeros in CPU req listing

There were too many zeros in the listing of users for CPU's.
render readme in help
render items from doc
Scan the text and add the help path.
Remove list items styling in show render.
Use the correct links, replace in search.
Replace existing links to help pages with the new ones.
Fix routing tests.
Make the updating documetation better for Omnibus users.