Add Filtering Options in All Boards Area

as a step towards this, I would find a lot of value in “show all boards not associated with a project”

I wish to have broad filter options by different criteria, e.g.

• hide all objects that are NOT red
• hide all objects that are before a specific DUE date
• hide all objects that are not elements of the TODO column (kanban)

This would allow to focus on specific aspects on the board even better.

Please add more board filters. Especially the ability to see if a board has no project associated with it, so we can keep track of random boards