Add contentSize warning to search Jupyter notebook

[vchendrix]

Jupyter Notebook should provide code to:

• Add table of contents for improving navigation
• Add a function that checks contentSize. Send a warning if the file is greater than some reasonable file size limit for download (5GB-10GB?). Send a positive response if it's below that limit.
• Maybe prevent the file from being downloaded if it's above the limit? So we would modify steps 6 and 7
• Styling Consistency: 4.b. uses HTML to display a "Files" header in the output (display_html("

  FILES

  contentSize is in kilobytes

  ", raw=True)). Display a similar header for 4.a. as well
• Test jupyter notebook with ESS-DIVE team members