Replace post-install message with HELP cheat sheet

HELP

+# GitLab Development Kit cheat sheet
+
+./run				# Start everything
+./run db			# Start enough to run tests
+./run app			# Start GitLab, need './run db'
+
+make gitlab_repo=https://my-fork	# Install everything
+make update							# Pull application changes from Git
+make clean-config all				# Delete and regenerate all config files created by GDK
+
+# Development admin account: root / 5iveL!fe

Makefile

@@ -99,7 +99,7 @@ support-setup: .ruby-version foreman Procfile redis postgresql openssh-setup ngi
 	@echo "*********************************************"
 	@echo "************** Setup finished! **************"
 	@echo "*********************************************"
-	@sed -n '/^## Post-installation/,/^END Post-installation/p' README.md
+	cat HELP
 	@echo "*********************************************"
 Procfile:

README.md

@@ -312,15 +312,11 @@ You can override the port used by this GDK with a 'port' file.
     echo 4000 > port
-If you want to work on GitLab CI you will need to install [GitLab Runner](https://gitlab.com/gitlab-org/gitlab-ci-multi-runner).
+If you want to work on GitLab CI you will need to install [GitLab
+Runner](https://gitlab.com/gitlab-org/gitlab-ci-multi-runner).
 To enable the OpenLDAP server, see the OpenLDAP instructions in this readme.
-END Post-installation
-
-Please do not delete the 'END Post-installation' line above. It is used to
-print the post-installation message from the `Makefile`.
-
 ## Development
 When doing development, you will need one shell session (terminal window)