Migrate links in Optimize 7 docs to hugo-based makro

[mboskamp]

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In the Optimize 7 docs, many pages are linked by relative links (e.g. ../../some-page).
Instead, we should use the hugo makro {{< ref "absolute/path/to/some-page.md" >}}

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• This issue might be more pressing if not migrating to the makro breaks the link checker or the hugo page.

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[mboskamp]

Some broken links were discovered during #4780. The CI succeeds, so I don't expect any broken links. But there are still usages of the relative links that we can migrate to the ref makro in hugo.

Having no breaking links means this ticket is low-prio now. I will move it to the follow-up section of #4716.