Adds some missing details to guides (#8676)
* more docs
* changes
* chatbot fast
* add environment variables guide
* add environment variables guide
* Update guides/09_other-tutorials/running-gradio-on-your-web-server-with-nginx.md
Co-authored-by: Ali Abdalla <ali.si3luwa@gmail.com>
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Co-authored-by: Ali Abdalla <ali.si3luwa@gmail.com>
