Sam Minnee 0e922895f2 FIX: Ensure that canonical URLs don’t redirect elsewhere.
Redirecting canonical URLs violate HTTP rules and break some search 
spiders including Swiftype.

As part of this change, DocumentationPage loses responsibility for
calculating canonical URLs. I’ve opted to leave the methods in there
but they will throw warnings.

Fixes https://github.com/silverstripe/doc.silverstripe.org/issues/181
2019-08-15 11:14:16 +12:00
..