fixes: BlockLinkCardList and Card metadata

[stephiescastle]

Checklist

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Description

Addresses feedback in https://github.com/nasa-jpl/www/issues/229 and https://github.com/nasa-jpl/www/issues/191

Instructions to test

1. make vue-storybook
2. View BlockLinkCardList story

Tested in the following environments/browsers:

Operating System

• macOS
• iOS
• iPadOS
• Windows

Browser

• Chrome
• Firefox ESR
• Firefox
• Safari
• Edge