[DOC] Explain what command each framework is running

[kcpevey]

Preliminary Checks

• This issue is not a question, feature request, RFC, or anything other than a bug report. Please post those things in GitHub Discussions: https://github.com/nebari-dev/nebari/discussions

Summary

Panel apps have a few different syntax options depending on how the apps are being served. We should explain the command that jhub-apps is running so that the proper syntax can be selected.

This should be done for all the frameworks.

REF: https://discourse.holoviz.org/t/using-panel-serve-renders-blank-page/1887

Steps to Resolve this Issue

Add more details in the docs on the commands that jhub-apps is running on behalf of the user.