Add documentation for using TBB with Windows Tor expert bundle

On Windows, I installed the expert bundle to have a single tor process to be used by multiple applications, including multiple Tor Browsers.

I can configure Tor Browser by creating a user.js file with extensions.torlauncher.start_tor set to 0. But this config also leads to this message:

"Something Went Wrong! Tor is not working in this browser."

Other than that, I can use the browser normally.

Can you fix this?

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