add cli docs

[aaazzam]

adds a command that reads the prefect typer app and renders it in a jinja template.

note we have some wacky docstrings in the cli, so some commands look goofy.

that said, this PR achieves the goal of adding the CLI commands to the docs (and in particular /llms-full.txt)

[zzstoatzz]

i love this! bc of how simply it seems like we could iterate on it and the status quo is empty

it seems like we should probably add a pre-commit to re-render and keep us in sync

[codspeed-hq]

CodSpeed Performance Report

Merging #17037 will not alter performance

_{Comparing cli-docs (33716c1) with main (b5012c4)}

Summary

✅ 2 untouched benchmarks

[aaazzam]

addressed everything @cicdw

only test failing is the sqlite flake #17036

[daniel-prefect]

For consistency, we should either drop the "Reference" and "Overview" suffixes or else ensure that all top-level items use the same suffix. I think removing makes more sense.

Suggested change

	"group": "CLI Reference",
	"group": "CLI",

[olearycrew]

My vote would be removing all the suffixes