Canonical URL for individual news articles based on permalink

[nickdenardis]

Reason for change

Because articles can be renamed and potentially accessed at different URLs, the Canonical URL assumes the current URL is the most up-to-date and uses that URL as the canonical.

This causes a situation where the same article could be accessed at multiple URLs, each with its own canonical URL. Search engines complained the same content was pointing to different canonical URLs.

This change forces the most up-to-date title (slug) to be used as the canonical URL so search engines index the correct URL.

Reminders

• Update package version number
• Frontend accessibility check
• Styleguide example in place
• New functionality covered by tests
• Screenshots of multiple screen sizes

Demo

Before	After

[coveralls]

coverage: 100.0%. remained the same
when pulling 41b48a7 on hotfix/8.10.6
into 86e8f76 on master.

[breakdancingcat]

👍