Edits to the getting stated guide after another run through

[natemccurdy]

This makes the following changes to the getting started guide after running through both the signed-in and signed-out paths:

• Added git as a requirement
• made it easier to modify the requirements by using all "1." list items
• Wait for the httpbin pod to be ready before continuing
• Make all the signed-out steps work
• Fixed sub-section header values so they show up in the TOC
• Fix minor typos and grammar issues
• Fix minor spacing and formatting inconsistencies
• Mark the ArgoCD guide as "coming soon"

Also fixed the docs for running the website locally to be able to preview all these changes while working on them.

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