Add Copy Download Link FAQ

[jaclyn-taroni]

Purpose

I am adding an FAQ that explains the Copy Download Link button on the Portal. Per the issue, I am also adding a short CHANGELOG entry.

Issue addressed

Closes #345 - I am choosing to go directly to main here, given the small scope, and we'll follow up with a merge main -> development.

Checklist for publishing to main

• This branch contains all commits/content ready to be released.
• The most recent CHANGELOG entry includes a date.
  If this release required a CHANGELOG entry, it should be today's date.

[jaclyn-taroni]

The spellcheck failure can be safely ignored – the placeholder date is what is triggering the failure.

[jashapiro]

This looks fine in content, but do we want it to go to main or development?

[jaclyn-taroni]

It seemed fine to me to go into main since we don't need to collect multiple PRs and then go from main to development, but I end up regretting that decision.

[dvenprasad]

LGTM

🐐 🐐 🐐