Issues/27 turn off not for launch features

* Removes comments and alerts and social media features from the application view
* Removes references to scraped data from the authority view
* Replaces content about scraped data per week/month with the `received_date` equivalents (assumes that `received_date` is present) and fixes a bug which caused the `applications_per_week` calculation to fail when using Postgres (even though we've just switched it off - we might want it one day)
* Fixes (hopefully) the bug which caused the Configuration override to load too late to be picked up in most rake tasks (e.g. `rake ts:rebuild`)

Closes #27