Replace MAINTAINERS.md with Team page

[cczona]

With the advent of the new Team page, MAINTAINERS.md is now redundant and less comprehensive. This removes that file and updates references.

NOTE: one reference remains, to be resolved by #16410

[stuhood]

The changes are missing here.

[cognifloyd]

@cczona It seems your changes got lost in the Floo network and didn't arrive in GitHub's fireplace. Do you plan on trying again? Or shall we close this PR and blame the Floo network?

[benjyw]

What is the status of this change?

[cczona]

I need to start over. My changes were somehow lost at my end and pushed. :-(

On Tue, May 9, 2023 at 10:39 AM Benjy Weinberger @.***> wrote:

What is the status of this change?

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[thejcannon]

If it's all the same, we can close this PR and when you have the changes going again we can open a new PR?

[cczona]

I'm working on recovering the SHA. Let's leave it open for a few more days. Thanks.

[kaos]

I think by now we can re-open if needed.