Feature request: be able to turn off notifications for some boards

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Is your feature request related to a problem? Please describe.
When someone adds me to a board, that I want to use just once in a while, I don't want to receive notifications from that board.

Describe the solution you'd like
Be able to toggle diffrent types of notifications for each board - maybe even simple start/stop receiving notifications from this board would get the job done.

Describe alternatives you've considered
There are none

Additional context
Would be helpful for some people, like me. It should be that hard to implement, just save the status of send/not send in the db for each user and then check it before sending push

No files or tests are identified in the issue. Start by locating the board notification and push-sending entry points, then determine how per-user, per-board notification settings should be stored. Done means users can stop or resume notifications for an individual board, with the selected notification types respected when notifications are sent.