[release-0.1] fix book image banner

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #1273

/assign Prajyot-Parab

fix book image banner

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: k8s-infra-cherrypick-robot
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[Prajyot-Parab]

/retest

[k8s-ci-robot]

@k8s-infra-cherrypick-robot: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cluster-api-provider-ibmcloud-build-release-0-1	533b5c3	link	true	/test pull-cluster-api-provider-ibmcloud-build-release-0-1
pull-cluster-api-provider-ibmcloud-test-release-0-1	533b5c3	link	true	/test pull-cluster-api-provider-ibmcloud-test-release-0-1
pull-cluster-api-provider-ibmcloud-verify-release-0-1	533b5c3	link	true	/test pull-cluster-api-provider-ibmcloud-verify-release-0-1

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[Prajyot-Parab]

/close

[k8s-ci-robot]

@Prajyot-Parab: Closed this PR.

In response to this:

/close

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