Fixed port mapping.

[munjal-gc]

Default project deployment is having wrong port mapping of 8080. Node application runs on port 3000.

This PR will fix - front-end-deployment when initial setup is done...

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[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: munjal-gc
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[knative-prow]

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

[munjal-gc]

Yes, this first PR as we are trying out the quickstart and bumped in to this issue.