PEP 752: Address feedback, round 2

[ofek]

1. Changed the Delegate from Donald Stufft to Dustin Ingram.
2. Renamed private/public terminology to private/shared.
3. Allowed community projects the ability to have private namespaces but still should be shared-only. The determination is at the discretion of reviewers.
4. Added a separate visual indicator for projects that are part of a shared namespace and are not owned by a grant holder.
5. Added a separate visual indicator for projects matching a private namespace that existed before the grant.
6. Made it explicit that root grants cannot overlap e.g. if there is a grant for foo-bar then one cannot apply for foo.
7. Adjusted language about the application review prioritization of corporate organizations.
8. Clarified that it is forbidden to replicate namespace configuration from other repositories.
9. Clarified the link between name-squatting attacks and dependency confusion.
10. Require a page in the UI for each namespace with metadata like the current owners.
11. Rather than encouraging a page that enumerates every namespace, this is now expressly forbidden.
12. Added a recommendations section that lives outside of the concrete specification.

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