index: Drop references to the 32 bit installer

cygwin is thinking about dropping it next year, so we'll have to do too:
https://cygwin.com/pipermail/cygwin/2020-April/244367.html

Let's start by removing the download button and see if anyone complains :)

docs/index.md

@@ -4,14 +4,9 @@
 </header>
 
 <a href="http://repo.msys2.org/distrib/x86_64/msys2-x86_64-20190524.exe" class="button">msys2-x86_64-20190524.exe</a>
- <small>← recommended</small>
 
 `SHA256: 2dacadcc70cc122054e60914cbc6b689f685bef5713915a90f4185dd9da7954e`
 
-<a href="http://repo.msys2.org/distrib/i686/msys2-i686-20190524.exe" class="button">msys2-i686-20190524.exe</a>
-
-`SHA256: c5a1881f7ac5a0449fe9b30d3140111a88072727f510c4a66bfa905f8c78e839`
-
 ## MSYS2 is a software distro and building platform for Windows
 
 At its core, it is an independent rewrite of MSYS, based on modern Cygwin (POSIX compatibility layer) and MinGW-w64 with the aim of better interoperability with native Windows software. It provides a bash shell, Autotools, revision control systems and the like for building native Windows applications using MinGW-w64 toolchains.
@@ -25,7 +20,7 @@ It features a package management system, Pacman, to provide easy installation of
 
 ## Installation
 
-1. Download and run the installer - "x86_64" for 64-bit, "i686" for 32-bit Windows
+1. Download and run the installer
 2. Click **"Next"**
 
     ![First screen of MSYS2 installation](images/1_msys32-start.png)