cats-effect

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It's annoying that we need this, but this trips everyone up, most recently @TimWSpence. We should add something to the docs demonstrating how to use CE with scala-cli by explicitly creating an IOApp in a .scala file, since stuff like unsafeRunSync() at the top-level of a .sc file will just hang.

Somebody wrote this, idk seems pretty good ;)

https://github.com/armanbilge/http4s-cli

There's the FAQ section of the documentation that contains an example. Is it worth extracting in its own subsection? And maybe adding a section that shows the usage of decline-effect + CE to write a command-line tool. What do you think?