fix example, document requirements to run example#6

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philippkeller wants to merge 7 commits intoklokantech:masterfrom

philippkeller:master

Commits on Jun 16, 2022

fix example, document requirements to run example
philippkeller
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Commits on Jun 18, 2022

flask_login requires either an id field or a get_id method
philippkeller
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Commits on Apr 28, 2023

redirect flow does not work with Safari (and most notably iPhone!) -> switching to popup
philippkeller
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