[release-1.8] fix(homepage): updated the customizing docs to include the details on customizing the Quick Access card icon.

[openshift-cherrypick-robot]

This is an automated cherry-pick of #3542

/assign debsmita1

[openshift-ci]

Hi @openshift-cherrypick-robot. Thanks for your PR.

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[debsmita1]

/ok-to-test

[lokanandaprabhu]

/lgtm

[invincibleJai]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: invincibleJai, lokanandaprabhu

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[github-actions]

The image is available at:

• quay.io/rhdh-community/rhdh:pr-3571
• quay.io/rhdh-community/rhdh:pr-3571-bc2f80a1