Publish extension to Open VSX Registry

[mtalexan]

Microsoft limits what/who can publish and access the Microsoft Marketplace that provides the default store for VSCode extensions. But an open registry exists, Open-VSX.org, that is compatible with non-Microsoft tools as well, like VSCodium.

Publishing to OpenVSX is very easy and there are even templates for GitHub actions to automate it. Details can be found here: https://github.com/eclipse/openvsx/wiki/Publishing-Extensions

[qwandor]

Thanks for the suggestion! Looks like I need @ogiekako to give me access to the Google namespace on Open VSX, but once that's sorted I'll publish this and my other extensions there.

[qwandor]

Done: https://open-vsx.org/extension/Google/selinux-policy-languages