refactor: directly render vue tree if root view is a ipyvue widget

[maartenbreddels]

Do not include a div in between temporarily. Since the widget view is created before we try to render the the upyter-widget-mount-point we do not need to get it asynchrounously via promises.

[maartenbreddels]

• #392 : 2 dependent PRs (#393 , #395 ) 👈
• master

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