Customizing Backpack asset documentation

[moniika]

Category Plugins

Component @blockly/workspace-backpack

Is your feature request related to a problem? Please describe. Changing the button asset for the Backpack is expected to be a common use case, there is no clear documentation on how to do so.

Describe the solution you'd like

A codelab or documentation on the plugin REAME to give advice on how to customize the backpack asset by overriding relevant protected methods (such as createDom).

Describe alternatives you've considered

none

Additional context