[WIP] Add link to download packet in /db/packet

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add link in /db/packet to download packet</issue_title>
<issue_description>Can have various formats, but probably pdf, docx, json are the most useful? would be generated from the questions and would not be based on the original file uploaded to quizbowlpackets.com

the logic can be similar to the logic for downloading search results</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add link in /db/packet to download packet #419

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