Hide about menu item if the widget is embedded

[ahmadkadri]

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Latest commit: ed3285861fa7f9d83e8623c693095a6843358330

The changes in this PR will be included in the next version bump.

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@nordeck/matrix-neoboard-widget	Minor

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[mgcm]

🤔 I am not sure if an environment variable is the way to go. But I am happy to discuss it.

When I discussed this PR with Ahmad, this was an option we considered as well.

The current status is that we have a couple more env vars that configure the widget, such as REACT_APP_HELP_CENTER_URL and REACT_APP_HOME_SERVER_URL, so given the low effort of adding yet another env var, it seemed reasonable.

I think having an embedded property in LayoutProps is a good option but as we are still discovering what new behaviours we should adjust for in the Widget, maybe this can slide thru as is?

I mean, will embedded only affect the canvas layout? Maybe it will have other non-layout related changes associated with it in the future..

Regardless of how it's implemented, what is missing in this PR is the documentation of how this flag affects the widget.