Move documentation into a docs folder

[VikashKothary]

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We should move the documentation into a separate folder. The advantage of this is it can then be deployed. See Readthedocs or the GitHub wiki.

It will also involve separating technical documentation from the open source docs which are meant for different types of users.

[cjekel]

This is fine. Are you going to work on it?

[VikashKothary]

It was just a thought while I was updating the documentation. Not the highest priority.