Cleanups
Docs: Add note on how to disable amaGama service
Docs: Add syntax highlight for examples
Migrations: Only delete unique constraints when appropriate
Migrations: Only delete profile_id column if it exists
Permissions: Use User in PermissionSetForm
Styleguide: Get rid of a deprecated import
Permissions: Update a comment
Migrations: Add migration dependencies for Suggestion migration
Migrations: Fix Suggestion data migration to run on old MySQL instances
Migrations: Improve dependency chain on postgres