Insert the <script> tag that monitors browser timing into the <head>
manually. This is to avoid this error:
Skipping RUM instrumentation. Unable to find <body> tag in first 50000 bytes of document.
See also https://docs.newrelic.com/docs/agents/ruby-agent/features/new-relic-browser-ruby-agent/#manual_instrumentation
Initializers
This directory contains initializers run by Rails during bootup. Initializers are generally used to configure libraries or other global settings during application boot.