How do you uninstall a community dashboard pack?
Currently, there is no option with the UI. Head to the following location on your SQUP server:
Remove the pack from here, recycle your application pool and confirm pack no longer displayed in Settings > Dashboard Packs
NOTE: This only applies to community and user created packs (where drafts are saved). The Everyone pack, for example, is where all published dashboards and perspectives are saved. DO NOT remove any of the default packs. Stuff gets a little hairy and may only be resolved with a reinstall.