Add "Download" button value; change button value on existing page

[josh-wong]

Description

This PR adds a "Download" button value and changes the value of a button in a component that mistakenly had the download button showing as "Read more."

Related issues and/or PRs

N/A

Changes made

• Added button.download to the list of available button values.
• Changed the button in the card component used on the passGen overview page from button.readMore to button.download.

Checklist

The following is a best-effort checklist. If any items in this checklist aren't applicable to this PR, add N/A after each item.

Documentation

• [x] I have updated the side navigation as necessary. N/A
• [x] I have updated the documentation to reflect the changes. N/A
• [x] I have documented or updated any remaining open issues linked to this PR in GitHub, Obsidian, etc. N/A

Build, deploy, and test

• [x] I have merged and published any dependent changes in other PRs. N/A
• [x] I have commented my code, particularly in hard-to-understand areas. N/A
• [x] I have checked that my changes look as expected on a locally built version of the docs site.
• [x] My changes generate no new warnings.

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