docs: Updated UI of the Footer

[JoyelJohny]

"Fixes #issue-number" or "Add description of the problem this PR solves"
Updates the UI of footer

Proposed Changes

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• ❌ - login: @JoyelJohny / name: Joyel Johny . The commit (8240cc2) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.

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[knative-prow]

Welcome @JoyelJohny! It looks like this is your first PR to knative/docs 🎉

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: JoyelJohny
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[Cali0707]

Hi @JoyelJohny thanks for making this UI change! I'm looping in our UX design leads since they are more experienced with UI changes

/cc @mmejia02 @zainabhusain227

[Cali0707]

Also @JoyelJohny would you be able to complete the CLA?

[knative-prow-robot]

PR needs rebase.

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