Updated CONTRIBUTING.md and general demo app structure to make it easier for community contributors to run and develop their own Dash Bio demo apps. This PR also has some general housekeeping to remove obsolete code/directories from the days of an independent Dash Bio gallery which is no longer necessary since all demo apps are hosted on the main gallery off the dash-sample-apps monorepo.
Closes #518
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Description of changes
Updated CONTRIBUTING.md and general demo app structure to make it easier for community contributors to run and develop their own Dash Bio demo apps. This PR also has some general housekeeping to remove obsolete code/directories from the days of an independent Dash Bio gallery which is no longer necessary since all demo apps are hosted on the main gallery off the
dash-sample-apps
monorepo.