The original instructions told the user to log into Discourse Admin settings in order to set the force_hostname parameter so that the email validation URLs would be correct. However, it is not possible to log in until email is validated. This commit adds instructions for setting force_hostname through the console.
This was the proposed change to add an optional step for including and configuring the Autoscaler Gem in the HEROKU.md doc. I've included a pastable version of the Sidekiq initializer file that only adds the autoscaler middleware in production.
