Improvements to microsite documentation (zio#633)

* Improve docs and remove the liftIO leftovers

* address feedback

* Exclude mdoc from unused dependency checker

* Exclude scalameta mdoc

* Fix typo

* Try random stuff

* Disable 2.13 in Travis

Merge pull request zio#593 from gvolpe/feature/trifunctor-cats-instances

Cats instances taking the environmental parameter

Merge pull request zio#597 from jdegoes/master

Fix semantics of `provide` and improve type inference

Fix typo on Overview microsite page

Merge pull request zio#582 from wi101/master

ZIO with contextual effects

Merge pull request zio#582 from wi101/master

ZIO with contextual effects

Merge pull request zio#570 from jdegoes/master

Simplify IO.blocking and fix subtle race condition

Merge pull request zio#569 from jdegoes/master

Fix, simplify, and improve IO.blocking

Skip monix-interop

zio#562

Merge pull request zio#536 from jdegoes/master

Add IO.blocking