Readme updates based on setup feedback about selfhost HOT 5 OPEN

After some feedback from Mac:
On step 7 of Quickstart guide add a note:
"If you use AWS, you will need to generate an RSA-based SSH key and save it to the file path ~/.ssh/id_rsa.pub"

This is mentioned in the AWS section but since people are working on step 7 before going to the Cloud providers some people are creating an ssh key and then seeing that they have to create a RSA-based one if they use AWS.

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I created a pull request for the SSH section.
#34

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Did you want me to try to update any of the other things here @andygeorge or did you get it already?

I could probably do:

• add note about Digital Ocean "Authentication contexts" to make that clearer
• add notes to each provider that let you know where your Forem VM lives at (looking at you, AWS EC2)

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@cmgorton if you're bored and want to knock those out, go for it! I am working on some other stuff at the moment, but will get to these ASAP.

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I would also suggest explaining the automated steps to register a domain in the cloud provider such as DigitalOcean where the domain name gets registered alongside DNS setup. It would be great if that part could be optional, as I have setup my domain to work with Cloudflare and I couldn’t make my self hosted Forem work without removing DigitalOcean domain setup due to that previous configuration I already had.

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