Adding banner for KubeConNA 23

[nainaz]

Adding banner on knative site for KubeConNA 23

Proposed Changes

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[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nainaz

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[ReToCode]

@nainaz this does not seem to look right to me:

Are the colors like this by intention?

[lance]

@nainaz this does not seem to look right to me:

Are the colors like this by intention?

@nainaz if you change the background color value on line 161 to FFE6FB you can remove the added background-color directive here. That should fix the color issue.

[ReToCode]

Closing this as kubecon NA has happened :)