Ability to re-arrange cards.

[duckbytes]

This is a frequently request feature. Users would like to be able to re-arrange the order of their cards.

Currently cards are ordered by the time created.

The simplest way to implement this would be to add an order int value to a task, however this would not be per user.

Per user ordering would probably require a new table.

Alternatively ordering could be saved by device only and not synced to the server.