Recommend installing Stack via GHCup

Author: tomjaguarpaw

site/downloads.markdown

@@ -17,8 +17,7 @@ This page describes the installation of the Haskell toolchain, which consists of
 
 *for Linux, macOS, FreeBSD, Windows or WSL2*
 
-1. Install GHC, cabal-install and haskell-language-server via [GHCup](https://www.haskell.org/ghcup/)
-2. To install Stack, follow the [Stack installation guide](https://docs.haskellstack.org/en/stable/install_and_upgrade/)
+* Install GHC, cabal-install, Stack and haskell-language-server via [GHCup](https://www.haskell.org/ghcup/)
 
 * * *