Remove references to staging/production.

There is no staging or production (it's just administrate-prototype), so
this is just confusing.

bin/setup

@@ -45,18 +45,10 @@ if ! command -v heroku > /dev/null; then
   printf "You'l need it to contribute to the demo app\n"
   printf 'https://devcenter.heroku.com/articles/heroku-cli for install instructions\n'
 else
-  # Set up the staging and production apps.
-  if heroku join --app administrate-prototype-staging > /dev/null 2>&1; then
-    git remote add staging git@heroku.com:administrate-prototype-staging.git || true
-    printf 'You are a collaborator on the "administrate-prototype-staging" Heroku app\n'
+  if heroku join --app administrate-prototype > /dev/null 2>&1; then
+    git remote add staging git@heroku.com:administrate-prototype.git || true
+    printf 'You are a collaborator on the "administrate-prototype" Heroku app\n'
   else
-    printf 'Ask for access to the "administrate-prototype-staging" Heroku app\n'
-  fi
-
-  if heroku join --app administrate-prototype-production > /dev/null 2>&1; then
-    git remote add production git@heroku.com:administrate-prototype-production.git || true
-    printf 'You are a collaborator on the "administrate-prototype-production" Heroku app\n'
-  else
-    printf 'Ask for access to the "administrate-prototype-production" Heroku app\n'
+    printf 'Ask for access to the "administrate-prototype" Heroku app\n'
   fi
 fi