Address new dynamic-scan findings

[ccostino]

Our dynamic scans are showing some new findings that we need to investigate and take care of.

Implementation Sketch and Acceptance Criteria

• Investigate the warnings being raised by the dynamic scans, which are powered by ZAP; you'll likely have to look at the documentation to see what the details are for the warnings and understand what they're referring to
• Work through our pages that are flagged with the warnings and see what needs to be adjusted.
• Make the necessary changes.

Security Considerations

• We want to make sure our site is accounting for all security issues and warnings so that it remains secure.