Add note about leaving terminal open when using Jupyter

Author: quist00

learners/setup.md

@@ -201,6 +201,13 @@ jupyter notebook
 The notebook should open automatically in your browser. If it does not or you
 wish to use a different browser, open this link: [http://localhost:8888](https://localhost:8888).
 
+::: prereq :::::
+## Leave terminal used to launch Jupyter open
+
+Jupyter depends on a server running in the background associated with the terminal used to launch it. Closing the terminal results in web interface errors. When done, you can eithr close the terminal or shut down the server using <kbd>CTRL-C</kbd> and submitting <kbd>y</kbd> within 5 seconds if the terminal is needed for other tasks.
+
+::::::::::::::::::::
+
 For a brief introduction to Jupyter Notebooks, please consult our
 [Introduction to Jupyter Notebooks](jupyter_notebooks.md) page.