Reduce links to support articles

[mattheworiordan]

We've historically used links to support articles as it's easier to add arbitrary support articles. However, this approach has a serious downside for customers who are reading our docs as the experience becomes inconsistent.

I think support articles will continue to have their place to address specific questions and provide answers, but I believe our goal should be that anyway who is using our docs, should in almost all cases never need to leave the docs.

Doing this will require us to:

• [ ] Think about how we structure the docs, specifically where pages live that don't exist in the nav
• [ ] Review which support articles should become documentation, and review all docs that link to support.ably.io -

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