Migrate Legacy Educator docs to an Orphan page

[jswope00]

This is a migration of the legacy educator docs from https://edx.readthedocs.io/projects/open-edx-building-and-running-a-course/en/latest/index.html

@feanil @jmakowski1123 the idea is to get this up so that we can start having people review and make suggestions and pull requests directly in the github editor, based on existing docs.

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[mphilbrick211]

@feanil @jmakowski1123 - Could you please review this when you get a moment? John is hoping to get it merged before the next educators WG so he can have a plan for Educators to submit fixes.

[feanil]

@jswope00 the change makes sense to me but I noticed that it's not directly navigable from the existing tree right now, is that intended? Or should there be a link from the educators home page to the WIP content?

[jswope00]

@feanil It is intended. This is still very much WIP and I plan to distribute this to a small group of volunteers to do all the necessary work cleaning this up before it is directly linked to the public.

[feanil]

Makes sense, merge away!

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