WIP: Change all Package Registry related links

What does this MR do?

In https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/32761, we consolidated all Package Registry related docs under the same roof. This MR changes the links in the app itself.

Original issue: https://gitlab.com/gitlab-org/gitlab-ce/issues/62600

1. Merge the docs first https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/32761
2. Merge the EE MR: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/16313
3. Merge this MR

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content