Document how to configure using winpty

[wez]

Roughly:

• Obtain https://github.com/rprichard/winpty/releases/download/0.4.3/winpty-0.4.3-msys2-2.7.0-x64.tar.gz
• Install the 64-bit version of msys2: https://www.msys2.org/
• copy C:\msys64\usr\bin\msys-2.0.dll alongside the winpty.dll in the extracted winpty dir
• copy wezterm.exe alongside both msys-2.0.dll and winpty.dll
• Set pty = WinPty in the wezterm.toml
• Start wezterm.exe

[wez]

Note that the mouse still doesn't work :-/

[github-actions]

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