SEO image paths need updating for files that have been moved

[DerekMelchin]

Expected Behavior

The github actions validate the image paths in the metadata.json files. If they are incorrect, the github action automatically fixes the path for us.

Actual Behavior

This isn't implemented yet. When we move files around, it's possible for us to forget to change the image file path in the metadata.json files.

Checklist

• [x] I have completely filled out this template
• [x] I have confirmed that this issue exists on the current master branch
• [x] I have confirmed that this is not a duplicate issue by searching issues

[jaredbroad]

Flagging the error seems easy but automatically fixing is hard - suggest we start with at least alerting us when the image has moved. This would be a simple scan for metadata.json and then validating all the images it contains. Failing the action if they're not all there.

[AlexCatarino]

The GitHub Actions don't commit to master, so the script can make the changes and create a new branch: https://github.com/QuantConnect/Documentation/blob/master/.github/workflows/code_generators.yml#L46 Then we can review the branch before merging.

[LouisSzeto]

For flagging the error, I think the URL tester is already doing so?

[LouisSzeto]

@AlexCatarino now PR #1640 will not erase the indicator reference image links. Maybe this can be closed.