Support using links in parents of nested items

[brc-dd]

Discussed in #1275

^{Originally posted by erondpowell September 2, 2022}
In our folder project, we are trying to use the nested sidebar feature.

• Each parent is a link to a page. ex: /configuration/data-model.md
• Each nested page is in a folder. ex: /configuration/data-model/relationships.md

Everything works fine in dev, but on prod testing, nested links are rendered multiple times.
We are not sure if it is a misconfiguration on our end, or a bug in the sidebar:
directus/docs#109

Thanks 🙏

[brc-dd]

x-ref: directus/docs#109 (comment)

Currently invalid HTML is being generated. Validator's output:

Start tag a seen but an element of the same type was already open.