Decommercialise the Help page

The help page in the manager contained traces of an ad block (unfinished, apparently) and a non-functioning Stripe integration so people can purchase support straight from the manager.

While I do recommend people to get in touch with MODX LLC if they need paid support, that does not belong right in the manager. This is after all an open source product. The link to the support page - which also mentions the MODX Professionals! - is sufficient lead generation.