So how can I share my dashboard without letting anyone know that I'm actually using kibana?
You can't hide this fact because under the hood an embedded dashboard is downloading lots of very specific scripts and is fetching data from a number of endpoints which are necessary to actually show data.
You could make it harder to access various parts with a variety of tricks, but none of them are really safe, except for deploying a security solution which locks down Kibana to only the parts needed to view a dashboard.
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