Squash Migrations into one & Change Migration Naming Schema

[mattyg]

Overview

• Squash all existing migrations into a single one
• Change naming schema for migrations to prepend with timestamps: i.e. 2022-06-06-17:25_migration_name
• Note migration nameing schema in developer docs

We will need to update any live production databases before merging this change, by inserting the migration name into db.migratoins such that it thinks it has already run this migration.