The link checker does not extract links in the `ImageLink` component

[arnaucasau]

The link checker is not verifying that the links used in the ImageLink component don't break. This is because we are not extracting links from any mdx components in:

https://github.com/Qiskit/documentation/blob/8650d17cb041262950542d87f13f0c4cc3f5dce9/scripts/js/lib/links/extractLinks.ts#L84-L96

[Eric-Arellano]

Some notes from our call:

• Arnau tried to fix this today by updating the markdown extraction, but it dramatically slowed down the overall script.
• There are two risks, the external links to YouTube and the links to our images.
  • We are not worried about the external link because YT is stable
  • We are somewhat worried about the image link
• Courses will use ImageLink a bit to link to YouTube, so this becomes a little more important.
• We want to spend <30 minutes to triage how good our error detection is currently. For example, will the pages render check catch this? From there, we can better triage

[frankharkins]

Note that we don't use ImageLink anywhere now (replaced with embedded videos).

[arnaucasau]

Closing the issue as not planned because we decided to remove the ImageLink component entirely.