Suggestion to Add a Startup Service Example in the Documentation

[Sma1lboy]

I have a suggestion to improve the documentation, which I believe will greatly benefit individual developers using Tabby.

Currently, the documentation provides detailed instructions on how to install Tabby via various methods. However, it might be more intuitive and helpful if there were also instructions on how to run Tabby as a local service that starts automatically on boot.

I prefer to have Tabby running in the background without having to remember to start the server each time we open our IDE. This could streamline our workflow and enhance the overall user experience.

For example, maybe using launchctl and systemctl for macOS/linux

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