Docs: remove About docs group

[julien-deramond]

Description

This PR reintegrates the entire About part that is still present in the codebase so that we don't forget to update (or not) these pages before the release.

I noticed that the "Extend" part has been removed from the codebase and sidebar, this is something we'd like to backport from v5? Or not useful in the docs anymore?

[mdo]

I noticed that the "Extend" part has been removed from the codebase and sidebar, this is something we'd like to backport from v5? Or not useful in the docs anymore?

I removed, yeah. Was much less useful in v6 I think. TBD on v5 backport.

[mdo]

Whole about section needs deleting or reworking. Not sure how valuable it is currently.

[julien-deramond]

Whole about section needs deleting or reworking. Not sure how valuable it is currently.

I'm in favor of deleting it too:

• Overview is mainly the history that anyone can find on Wikipedia
• Team: anyone can find who's active in the GitHub repo
• Brand: nobody's supposed to really use the brand, and the logo is generally pick up from Wikimedia, or directly from the docs website
• License is already supported by the LICENSE file
• Translations is sometimes an issue with some repositories embedding malware and stuff

If you're down to delete this entire part, I can modify this PR to remove the pages.

[mdo]

If you're down to delete this entire part, I can modify this PR to remove the pages.

Ya let's remove it.