Offer zip builds

[ghost]

If you go here:

http://forge.rust-lang.org/other-installation-methods#standalone-installers

you see MSI and TAR.GZ installers for Windows. This is strange because typically
programming language vendors will offer:

1. MSI or EXE installer
2. ZIP file with compiler or interpreter that can be extracted and run

the Rust TAR.GZ is similar to option 2, but if you extract rustc.exe wont
actually run because even with the TAR.GZ it has to be extracted and installed
before rustc.exe is usuable. This contrasts with other programming languages that offer both an executable installer and ZIP files that can be extracted and run. For example Go:

https://golang.org/dl

and Nim:

https://nim-lang.org/install_windows.html

Python:

https://python.org/downloads/release/python-373

and C#:

https://dotnet.microsoft.com/download/dotnet-core/2.2

PHP:

https://windows.php.net/download

Perl:

http://strawberryperl.com/releases.html

[ehuss]

Closing/moving to rust-lang/rust#116028, since this website doesn't control which release installers are published.