This VSCode.dev standalone site adds Azure Repos support in addition to Github.dev's existing GitHub support, and they say it will be extendable by extensions so maybe hope for Gitlab/Bitbucket/Gitea/Sourcehut/who knows who else to add this sort of remote dev experience that the Github dot shortcut does.

Also, there's a new "Theme Preview Playground" which lets you write URLs to try theme extensions before you download them.