Update the 'Deployments overview' page with the framing from the 'Renaming the Task Server' notion doc

[daniel-prefect]

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Describe the issue

We don't do a good job of explaining the difference between flow.serve and flow.deploy in our docs.

Describe the proposed change

@abrookins did a nice write-up with a great framing of flow.serve of workers that we should incorporate into the 'Deployments overview' doc: https://www.notion.so/prefect/Renaming-the-Task-Server-819f90e162df47c7801c160155deb783

Additional context

No response