* Adds `preview.js`
to replace the legacy `umbraco.websitepreview.min.js` script.
Updates the content's `Id` with `Key`.
* allow any protected route to render the backoffice
* optimise component so it doesn't need to observe its attributes and use the popover API to show it on top of the content
* handle case where the culture could be set to "invariant" - we just want to set the "lang" attribute to the default ui language
* convert 'end preview' into an api request and reset the style of the button
* minimize function
* move static text into constants
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Co-authored-by: Jacob Overgaard <752371+iOvergaard@users.noreply.github.com>
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