Feature: BlockCardGrid

[stephiescastle]

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Description

Supports https://github.com/nasa-jpl/www/issues/225

• Renames BlockCardGroup to BlockCardGrid that supports optional link and description
  • To support a link, I included hover styles from BlockLinkCard. Still somewhat odd that there is no visual differentiation between a card vs a linked card without hovering over it though.
• Updates PageRoboticDetail to correspond with the new block name and field names
• Adds BlockCardGroup to BlockStreamfield
• Adds a "Cards" section to Storybook, including an overview page.

Instructions to test

1. make storybook
2. view:
   • http://localhost:6006/?path=/story/components-cards-blockcardgriditem--base-story
   • http://localhost:6006/?path=/story/components-blocks-blockcardgrid--base-story
   • http://localhost:6006/?path=/story/components-blocks-blockstreamfield--base-story (view the bottom)
   • http://localhost:6006/?path=/story/templates-www-pageroboticsdetail--template

Tested in the following environments/browsers:

Operating System

• macOS
• iOS
• iPadOS
• Windows

Browser

• Chrome
• Firefox ESR
• Firefox
• Safari
• Edge