GRN2-xx: Removed Health Check Gem (#840)

* Initial work on removing health check gem

* Added health checks

* Fixed gemfile

config/routes.rb

@@ -17,7 +17,7 @@
 # with BigBlueButton; if not, see <http://www.gnu.org/licenses/>.
 
 Rails.application.routes.draw do
-  get 'health_check', to: 'health_check/health_check#index'
+  get '/health_check', to: 'health_check#all'
 
   # Error routes.
   match '/401', to: 'errors#unauthorized', via: :all, as: :unauthorized