Move Chris Short to Emeritus

[chris-short]

PR to officially emeritus Chris Short

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offboarding checklist:

• [x] @scottrigby remove Chris from appropriate GitHub Teams (@open-gitops/chairs, @open-gitops/maintainers, @open-gitops/gitops-environmental-sustainability, @open-gitops/media)
• [x] @scottrigby request removing Chris from cncf-opengitops-maintainers@lists.cncf.io. Requested: https://cncfservicedesk.atlassian.net/servicedesk/customer/portal/1/CNCFSD-2260?created=true
• [x] @scottrigby request removing Chris from CNCF service desk OpenGitOps group. Requested: https://cncfservicedesk.atlassian.net/servicedesk/customer/portal/1/CNCFSD-2261?created=true
• [ ] @chris-short would you please transfer ownership of #gitops-chairs cncf slack channel to other chairs (currently Dan & Scott)? Thanks