[web] Disable App Banner

[tbsbdr]

Issue Description

The app banner is not in shape for a public release. It would need further improvements, which we can't schedule right now, as the priority for the feature is too low.

• detection for when to show the app banner does not work reliably, see [web] Open in web or app banner #9139 (comment)
• install link for users who don't have the app installed is missing, see [web] Open in web or app banner #9139 (comment)

Please track times

Requirement / acceptance criterion

• Don't show the app banner if the appBanner key is missing or empty in the theme.json.
• adjust in dev docs how to enable/disable the feature

[tbsbdr]

cc @michaelstingl

[michaelstingl]

@tbsbdr aren't current config options sufficient? Isn't there an option to disable it?

• Add documentation for app banner config #9836
• added docs for app banner #9872

[tbsbdr]

naa, there is no option to disable it 😢

[AlexAndBear]

We could add an option alternatively?

[michaelstingl]

Yes, config option please, and keep it enabled on our continuous deployments. This way, the teams can continue iterate on it and improve.

[AlexAndBear]

Let's discuss this in spring planning today

[kulmann]

Thanks for feedback, I updated the issue description accordingly. We need to decide if we want to put disabling the app banner into the config.json where we would usually do something like that or into the theme.json where all the app banner info lives.