Revert "Send front-end PageView custom metrics to New Relic Insights."

This reverts commit 0eab6f6b.

playbooks/roles/newrelic/templates/etc/newrelic/nrsysmond.cfg.j2

@@ -231,9 +231,3 @@ labels={{ labels }}
 #          path if, for example, you have multiple CGroup mounts.
 # Default: Distribution dependent, but usually /sys/fs/cgroup or /cgroup.
 #cgroup_root=
-
-# Allow custom attributes to be sent to Insights for browser PageViews
-#
-# https://docs.newrelic.com/docs/agents/python-agent/installation-configuration/python-agent-configuration#browser-settings
-#
-browser_monitoring.attributes.enabled = true