[Documentation request]: Page about stylus support

[CodeDoctorDE]

To which page is your issue related?

No response

Describe your documentation request!

Currently it's only a part of the FAQ.
Maybe add a whole new page to explain the features in it.
We should mention the pen only setting (which has been changed in 2.5), the pen shortcuts, the missing support on desktop, the input test and the setting "Ignore pressure" (it's set to first because firefox reports the wrong pressure on the first input). Also add the issue link for flutter which was in the faq previously.

Additionally we should add a link from the faq to the new page

Additional context

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