Add Benjie and archiving Playground to next meeting

[benjie]

We may not actually need a meeting for this, but I'd like to discuss archiving GraphQL Playground. If we agree to do so, I think we ideally need a document that details how to move from Playground to GraphiQL - does such a document already exist? Then we'll update the playground README to point to it, and mark the repo as archived.

Main reason for archiving: it seems unmaintained, and most of the functionality is now available in GraphiQL?

cc @acao @dimaMachina @thomasheyenbrock @yaacovCR

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