Replace outdated links to Git for Windows' wiki

Git for Windows' wiki pages were migrated in git-for-windows/git-for-windows.github.io#59.

Author: dscho

winget_git.ini

@@ -1,5 +1,5 @@
 [Setup]
-; https://github.com/git-for-windows/git/wiki/Silent-or-Unattended-Installation
+; https://gitforwindows.org/silent-or-unattended-installation
 Lang=default
 Dir=C:\Program Files\Git
 Group=Git