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

Currently Attributes only have javadoc; I don't see a major heading on the doc site for them, and googling "http4s attributes" just brings back the api docs for me.

Currently, we manually append the params to the url / query string using urljoin. Instead, we can send the query params in as a dictionary

Since health checks might be invoked from frontend dashboards, the core of sup could possibly be cross-compiled using Scala.js. Other modules like http4s-client, sttp and circe could benefit as well.