Upgrade site and modules to Django 2.2. Remove and replace obsolete
functionality with current equivalents. Update requirements to latest
versions where possible. Remove unused dependencies.
* Tweaks help_text to indicate that travel assistance is to Sydney
* Includes the required migration
This migration doesn't change the DB so it's safe to apply with the system live.
Link to the T&C and Code of conducts so people know what they are
accepting. Create this as a static link because i don't know how django
would accept this being something dynamic on the model.
This annoyingly creates a migration, but it's not a real change and
easier to accept it now than fight django forever.
