Repair obtaining package release build workflow

[hxtree]

Ran into an issue where AWS VPN did not install TAP and needed to find and install manually, which due to SEO wasn't easy.

Despite references to in the "Getting Tap Windows WIKI" page, there are no Github packages available for download. The link to Github Downloads provided in the WIKI does not work: https://community.openvpn.net/openvpn/wiki/GettingTapWindows#Gettingtap-windowsreleases

Please could a link be added to the README.md to assist those who don't necessarily want to build the code in obtaining a built release. e.g.

Releases are available:
http://build.openvpn.net/downloads/releases/

Or perhaps using Github Action to build release package, etc.

Thank you for considering.