Simplification of install Guide (PR #13716)

Working with @osioke to simplify a few pain areas of the install guide.

Still a Work in progress, More changes incoming.

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The title of this pull request changed from “[WIP] Simplification of install Guide” to "Simplification of install Guide

@osioke let’s keep Jay in there for now, unless we hear from Jeff about it. That would also remove the need for the or less bit :+1:

Let’s replace this sentence with “Alternatively, you can ssh into your server and rebuild:”?

I don’t want to keep adding things to this doc but maybe a word or two in this sentence could link to How to migrate from one platform / forum to Discourse - migration - Discourse Meta?