police

When in the "Edit Officer Assignment" form (https://openoversight.com/officer/<officer_id>/assignment/<assignment_id>) the Unit dropdown shows all units in the database, not just those of the officer's department. Only the units that belong to the officer's department should be shown here and the backend part of the form should also reject trying to assign a unit from a different department.

As a part of the Code Quality Challenge, there was a PR removing TODOs that was removed which wanted to describe the Database Cleaner strategy used. I figured this should be a separate issue instead.

• Please name it Azure_Deploy.md
• Make and place it inside the Guides/ directory of the master branch
• Add Snapshots of the process as and where required
• Add Useful Tips section for certain optimizations, bug fixing advice, and site corresponding references