[Doc] Improve keplergl-jupyter documentation

[MilheiroSantos]

• Removed reference to deprecated {} icon that no longer exists in current version.
• Added FAQ & Troubleshoot entry to table-of-contents
• Clarified sentence on Windows support

Closes #1540

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[igorDykhta]

Hi @MilheiroSantos You have to sign your changes with DCO. Follow https://github.com/keplergl/kepler.gl/pull/2697/checks?check_run_id=31546536085

[MilheiroSantos]

Hi @igorDykhta

Thank you for the heads up, I've changed the commit message and DCO.