[Bug]: Create a pkgdown.yml config at the root level for autolinking references

[cicdguy]

What happened?

The root level pkgdown.yml must contain the proper path-based URLs for the articles and references and must be placed at the root level as this is what downlit::autolink() uses to construct references.

Relevant log output

See https://github.com/insightsengineering/teal.modules.clinical/blob/gh-pages/pkgdown.yml for example.

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