All branches are being sync'd to dj_starter_demo which is not valuable

[coreyshuman]

All branches are being sync'd to dj_starter_demo which does not provide value and causes additional friction because dj_starter_demo becomes a mess of stale and unused branches. Additionally this is a poor use of resources, since I would only expect develop or main branch updates to sync to that demo repo.

Todo: update circleci scripts to only push to dj_starter_demo for develop and main branches