#169/message item deleted

[camelPhonso]

Description

Closes #169

If an item is deleted all conversations related to that item will now receive a notification informing that it is no longer available. Conversations no longer get automatically deleted.

Files changed

• DeleteButton.tsx - edited the handler to call insertSystemMessage before deleting the item
• markAsRead.ts has been renamed to markMessageAsRead.ts since we also have a markConversationAsRead.ts in the works. This change touched a few other files where we import the function
• SystemMessageCard.tsx - was re-styled slightly because it was sitting flat against the bottom of the wrapper at the start of conversations
• new migration file - this PR includes a change to the database that removes the item_id foreign key from user_conversations table
• selectConversationsByItemId.ts - new util that returns all active conversations that relate to an item
• insertSystemMessage.ts - added documentation to this util because I kept needing to check whether it need an id from conversations or user_conversations

UI changes

Conversations now get a new SystemMessageCard.tsx added when the relevant item is deleted from the database

Changes to Documentation

This PR did not require any additional documentation.

Tests

No new tests 😓 - testability for our components is yet again being worked on in another issue

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[nichgalzin]

Besides that one naming suggestion I commented on below this is some hot stuff! Love it, and neatly done. Good job babes!