Most awesome FP libraries (Cats, Scalaz, Monocle, Algebird etc ) have microsite done by sbt-microsites

Adding one for Shapeless would make it easier for newcomers. Quick, online reference on what is available

It should cover when you'd use and how to use:

• parEvalMap/Unordered
• parJoin
• concurrently
• merge*

There's the page on Queue/Topic/etc but there's not a great single page on the operations directly on Stream. The Guide section on concurrency is very short and doesn't cover some of the most common operations (parEvalMap especially)

Maybe it is better to use for loop inside a flow's body? Let's measure.

flow is a hot path, so we need to speed this up as much as we can.
Link: https://github.com/dry-python/returns/blob/0f7d02d0c491a7c65c74e6c0645f12fccc53fe18/returns/_internal/pipeline/flow.py

Follow up on typelevel/cats-effect#1361 (comment)