use the new anchor functionality in the redesign

[mansona]

For example: in the current version of the guides we have a "show on hover" anchor/link thing: https://api.emberjs.com/ember/5.2/classes/Application/methods/advanceReadiness?anchor=boot

The new version looks different and is always visible: https://guides.emberjs.com/release/components/#toc_the-application-template

[mansona]

@lukasnys said they would do this one 🎉