"Attend a Working Group or Committee meeting" link gives a 404

[christianh814]

Under https://opengitops.dev/get-involved the "Attend a Working Group or Committee meeting" leads to a page that doesn't exist

[lloydchang]

Thanks @christianh814

This duplicates #41

Since we're moving from gitops-working-group to cncf/tag-app-delivery/gitops-wg, #41 proposes changing from
https://github.com/gitops-working-group/gitops-working-group/blob/main/MEETINGS.md
to
https://github.com/cncf/tag-app-delivery/tree/main/gitops-wg#meetings