Re: [PATCH] docs: set canonical base URL for HTML output

[Rito Rhymes]

To be clear:

canonical URL + local build = useless

canonical URL set by env var + official published build = source
authority support

hardcoded canonical URL in the source tree + mirror deployments =

1. Benign mirror benefit
    Mirrors inherit a source-authority-supporting default without
    needing to think about it or configure anything themselves.

2. Adversarial / careless mirror mitigation
    Anyone who does not want to preserve that signal must take an
    extra step to remove or override it, adding at least some
    friction to careless or hostile reuse. 

Hardcoding it is simpler, safer and more effective because it makes
preservation of the preferred source the path of least resistance,
requires any departure from it to be explicit, and costs local builds
very little without side effects.

Rito