feature: BlockAccordion

[stephiescastle]

Checklist

• Include a description of your pull request and instructions for the reviewer to verify your work.
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Description

Completes https://github.com/nasa-jpl/www/issues/379

Instructions to test

1. make vue-storybook
2. View the BlockAccordion story: http://localhost:6006/?path=/story/components-blocks-blockaccordion--base-story

Tested in the following environments/browsers:

Operating System

• macOS
• iOS
• iPadOS
• Windows

Browser

• Chrome
• Firefox ESR
• Firefox
• Safari
• Edge