Update usage.md

removed getting started link as the file was removed in previous commits
Merge branch 'patch-1' of github.com:luislobo/server-configs-nginx into luislobo-patch-1

* 'patch-1' of github.com:luislobo/server-configs-nginx:
  Update usage.md

Conflicts:
	doc/usage.md
Merge branch 'luislobo-patch-1'

* luislobo-patch-1:
  Update usage.md