Recently Deleted

[jasonlim131]

• encode parent child relationship
• implement recently deleted stack
• data object which reference config.json
• reorganize config.json to address these changes
• integrate Immer for stack integrit
• implement Redux global state management

Tests:

• deleting a column deletes all the children but ofc, saves it
• deleting a card does not delete the column
• The exact number of cards are retrieved by 'undo'
• serial deletion and undo
• serial undos followed by serial redos