docker: Remove need for static_asset_compiler.

Now that the way we're installing from Git involving building a
release tarball with a 2-stage build, we no longer need to do this.

puppet/zulip/manifests/dockervoyager.pp

@@ -9,7 +9,6 @@ class zulip::dockervoyager {
   include zulip::app_frontend
   include zulip::supervisor
   include zulip::process_fts_updates
-  include zulip::static_asset_compiler
 
   file { '/etc/supervisor/conf.d/cron.conf':
     ensure  => file,