Describe the bug
while filtering the permited post types via distributable_post_types, I noticed that the dropdown in de Pull UI has all the post types in the dropdown.

Steps to Reproduce
Filter the permited post types:

add_filter( 'distributable_post_types', function() {
    return [ 'post' => 'post' ];
});

Go to the Pull overview page en check the dropdown.

The README at https://github.com/cloudposse/charts/blob/0.6.0/incubator/README.md refers to the opsgoodness chart repo at http://charts.opsgoodness.com but that repo does not seem to be working. In fact, it's not clear that this README is actually meant for that directory. It should be fixed if not deleted.