ci: remove markdown-link-check configuration

[MikeMcC399]

Issue

markdown-link-check now runs successfully without the configuration file md-linkcheck.json.

md-linkcheck.json was added because automated markdown link checks to the github.com domain were returning HTTP 403 forbidden. This problem is no longer occurring and so a workaround is no longer necessary.

Change

Remove the file md-linkcheck.json and the reference to it in the script

github-action/package.json

Line 16 in c390a59

"check:markdown": "find *.md docs/*.md -print0 | xargs -0 -n1 markdown-link-check -c md-linkcheck.json",

Use instead default settings.

Verification

npm ci
npm run check:markdown

Confirm all link checks are successful.

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