docs: Add connect to operations

[malexander2012]

What this PR does / why we need it:
This adds connect to the operations doc.

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

Yes No Yes

Special notes for your reviewer:
Not sure what else to put in the Required Behaviors and Permissions Required. Need a little help here.

[JaydipGabani]

@malexander2012 operation.md refers to all the operations that gatekeeper supports, here is the list of it - https://github.com/open-policy-agent/gatekeeper/blob/master/pkg/operations/operations.go#L18. We enable gk webhooks to allow validation of connect operations - https://github.com/open-policy-agent/gatekeeper/blob/master/charts/gatekeeper/templates/gatekeeper-validating-webhook-configuration-validatingwebhookconfiguration.yaml#L68 recently. We should close this PR if the interntion was to update the GK docs with latest information about supported operations.

[ritazh]

You can add a new section for “how to enable validation of connect operations”, similar to: https://open-policy-agent.github.io/gatekeeper/website/docs/customize-admission/#how-to-enable-validation-of-delete-operations

[malexander2012]

You can add a new section for “how to enable validation of connect operations”, similar to: https://open-policy-agent.github.io/gatekeeper/website/docs/customize-admission/#how-to-enable-validation-of-delete-operations

Sure thing. I'll add that section below the section you referenced. Thank you.