feature: GitHub gist embed block

[jamesray]

Checklist

• Include a description of your pull request and instructions for the reviewer to verify your work.
• Link to the issue if this PR is issue-specific.
• Create/update the corresponding story if this includes a UI component.
• Create/update documentation. If not included, tell us why.
• List the environments / browsers in which you tested your changes.
• Tests, linting, or other required checks are passing.
• PR has an informative and human-readable title
  • PR titles are used to generate the change log in releases; good ones make that easier to scan.
  • PRs will be broadly categorized in the change log, but for even easier scanning, consider prefixing with a component name or other useful categorization, e.g., "BaseButton: fix layout bug", or "Storybook: Update dependencies".
• PR has been tagged with a SemVer label and a general category label, or skip-changelog.
  • These tags are used to do the aforementioned broad categorization in the change log and determine what the next release's version number should be.
  • Release Drafter will attempt to do the category labeling for you! Please double-check its work.

Description

gist block, embed gists with just a URL and caption (links to github source)

Instructions to test

make vue-storybook see the blockGist story here

Tested in the following environments/browsers:

Operating System

• macOS
• iOS
• iPadOS
• Windows

Browser

• Chrome
• Firefox ESR
• Firefox
• Safari
• Edge

[jamesray]

https://github.com/nasa-jpl/www/issues/173#issuecomment-2293349164

[stephiescastle]

@jamesray would you be able to address the accessibility issue? You can determine the exact issue by opening storybook, going to the BlockGist story, then viewing the accessibility tab.

[stephiescastle]

One more note: the block also needs to be added to BlockStreamfield

Thank you!

[jamesray]

Changes requested are done. integrated into frontend at nasa-jpl/www #385

[stephiescastle]

@jamesray Looks good to me. I can't recreate the failing accessibility test that CI found.

Mind updating this with latest main? Then we'll let actions run again and see what happens.

[jamesray]

@stephiescastle passed, I can remerge in the other changes to main tho