chore(pp): comment out gem packages for now

This is not working correctly when ruby is installed with RVM. It will
need some debugging that will need to be done another time.

For now the only one getting use is puppet-lint, if this is not found it
can be installed when need.

site-modules/core/manifests/packages.pp

@@ -49,10 +49,10 @@ class core::packages {
   #
   # Ruby gems to install globally
   #
-  core::packages::gem { [
-      'neovim',
-      'mail',
-      'pandoc-ruby',
-      'puppet-lint',
-  ]: }
+  #core::packages::gem { [
+  #    'neovim',
+  #    'mail',
+  #    'pandoc-ruby',
+  #    'puppet-lint',
+  #]: }
 }