Update: Handle database relations in case of deleting user

[MTG2000]

Previously, it was not possible to directly delete a user entry from the Users db table, because there are a lot of tables with relations to the user, & you need to manually delete those entries with relation before deleting the user's entry.

But obviously, this is very tedious, so I've updated the DB schema to include rules for automatic handling of the deletion of the user.

All the entries with a user relation will be automatically deleted when a user is deleted EXCEPT:

• Vote
• Story
• Question
• Donation

Those above will be set the user_id field to null.

@johnsBeharry If you have some different thoughts on the rules, let me know.

NOTE I haven't migrated these DB updates on the production DB, so the deploy preview won't likely work correctly.

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