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Add canonical links to help Google find latest release
Google is selecting old versions as canonical and not indexing newer versions.
Adding code to head-end to pick up the following from the front matter.
-
isCanonical
: add a canonical link to itself as the canonical page -
canonicalUrl
: add a link to another URL which is the canonical version of this page
isCanonical takes priority over canonicalUrl
The PR also makes all the latest versions (e.g. refguife/…) canonical and adds canonical URLs to the most commonly returned refguide7 docs.