switch to using vscode.workspace.fs for loading vega graphs from remote workspaces
should also work with new github/codespaces integration once I get beta access to it.
see: https://github.com/microsoft/vscode/issues/104199#issuecomment-687864712
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https://code.visualstudio.com/updates/v1_37?ref=codebldr#_vscodeworkspacefs
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https://code.visualstudio.com/api/advanced-topics/remote-extensions#incorrect-execution-location
looks like everything works just fine on new github codespaces without using workspace.fs.
I just need to set vscode styles for the VV toolbar dropdowns & scrollbars ...

I might still have to do this and add new web extension entry point to get Vega Viewer working on https://vscode.dev.
See here for more info: https://code.visualstudio.com/api/extension-guides/web-extensions
Closing this for now as I have not seen requests for more features with remote workspaces and web versions of this extension.