Update contribute docs

[whoabuddy]

This PR fixes some typos, tweaks some copy, and updates the listed directories for /docs.

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Name	Status	Preview	Updated
stacks-docs	✅ Ready (Inspect)	Visit Preview	Jan 11, 2023 at 7:29PM (UTC)

[wileyj]

@whoabuddy there has been a huge docs update - can you rebase/fix these conflicts?

[wileyj]

@whoabuddy there has been a huge docs update - can you rebase/fix these conflicts?

ping @whoabuddy

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