anchor links in a template block aren't relative to the page #16708
Description
https://deploy-preview-16670--preliminary-istio.netlify.app/latest/docs/ambient/usage/l7-features/ started with this markup
{{< warning >}}
The VirtualService and EnvoyFilter APIs are not supported in waypoints. [Read more below](#unsupported-apis).
{{< /warning >}}
which generates a link to https://deploy-preview-16670--preliminary-istio.netlify.app/latest/#unsupported-apis and not to https://deploy-preview-16670--preliminary-istio.netlify.app/latest/docs/ambient/usage/l7-features/#unsupported-apis as expected.
This is probably because the template adds a / in front of the URL.
Research kicking-off points:
* https://discourse.gohugo.io/t/after-hugo-update-0-88-1-0-142-0-anchor-links-with-have-a-leading-slash/53333/7