Edit pass of docs/cli/index.md (#999)

Make a pass through the docs/deployment.md file to hopefully improve readability and conciseness

Notably, I've proposed axing both the "Core Features" section - which feels too promotional this far down the folder hierarchy and which is somewhat repetitive to later in the page - and the "Basic Interaction" section - which is covered better, and makes more sense, in other parts of the documentation

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