Add extension to Open VSX Registry

[remusa]

Describe what's missing

The extension can't be found in Open VSX Registry

How would it work

The extension would be available in Open VSX Registry (same as the Abracadabra one by the same author).

[tennox]

Here are some more details about OpenVSX, its goal, and why it was created

For that reason, I can't use your extension anymore, could you publish on OpenVSX too? (It's typically just a matter of running npx ovsx publish you can also check the full guide for publishing)