Ignore images in code snippets

[kendallgassner]

If a user adds an image in a code snippet, we should ignore the alt text.

<img alt='' src='' /> 

[github-actions]

Uh oh! @kendallgassner, the image you shared is missing helpful alt text. Check your issue body.

Alt text is an invisible description that helps screen readers describe images to blind or low-vision users. If you are using markdown to display images, add your alt text inside the brackets of the markdown image.

Learn more about alt text at Basic writing and formatting syntax: images on GitHub Docs.

[github-actions]

Uh oh! @kendallgassner, the image you shared is missing helpful alt text. Check your issue body.

Alt text is an invisible description that helps screen readers describe images to blind or low-vision users. If you are using markdown to display images, add your alt text inside the brackets of the markdown image.

Learn more about alt text at Basic writing and formatting syntax: images on GitHub Docs.

[khiga8]

This ties to #28, which I believe is raising a false positive due to the code snippet in the release notes.

I think the long term solution is going to be to use a markdown parser like markdownlint to parse the markdown body and raise errors, rather than regex matching the string with bash like we currently do. This would be a pretty big overhaul of the code, but we do have existing markdownlint rules we could use in markdownlint-github.