Hide (not close) sidebar icon

[martrdev]

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Is your feature request related to a problem? Please describe.

I am trying to deploy an app that has persisted data but doesn't automatically allow the users to check their data history.

Describe the solution you'd like

Add a variable in the config.toml file that allows to hide the icon, e.g. default_sidebar_state = "hidden"

The outcome should show the chainlit UI without the sidebar icon but the application would still be able to persist data.