📖 Update README to point to new agenda document.

[davidewatson]

What this PR does / why we need it:

Otherwise it takes two extra clicks to get to the meeting notes (one to open the current document, and other to close the old one).

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

N/A

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[davidewatson]

/check-cla

[detiber]

/lgtm

[vincepri]

/approve

Happy 2021!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vincepri

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[detiber]

/test pull-cluster-api-test-main