[Docs]: Improve contribution docs

[MatthewSH]

Tasks

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1. [Docs]: State the recommended code editor used by developers (if applicable) #3170
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2. [Docs]: Create a "Testing" section and move that out of getting started #3171
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3. [Docs]: Move .env step to a "Testing" section #3172
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4. [Docs]: List per-requisites (Node, etc) in getting started section #3174
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5. [Docs]: "Pull Request Guidelines" section #3175
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6. [Docs]: "Documentation" contribution section #3176
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7. [Docs]: List the root project scripts #3179
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8. List technology we use (Turborepo, etc), I don't think this is needed actually?
9. [Docs] Update "for every contribution" to account for Husky #3162
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Spec

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1. Contributor could know repo layout
2. Contributor could know dev tools
3. Contributor could know how to test
4. Contributor could know how to pr