frontend: Perform improvements in age column

[elenzio9]

In this PR:

• Rename Age header to Created at
• Right-align the age column
• Extend Makefile to include prettier UI format check

[orfeas-k]

Looks good, thank you @elenzio9! /lgtm cc @kimwnasptd

[kserve-oss-bot]

@orfeas-k: changing LGTM is restricted to collaborators

In response to [this](https://github.com/kserve/models-web-app/pull/54#issuecomment-1381882816): >Looks good, thank you @elenzio9! >/lgtm >cc @kimwnasptd Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[kimwnasptd]

Thanks for taking a look @orfeas-k!

/approve

[kserve-oss-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: elenzio9, kimwnasptd

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[kimwnasptd]

/lgtm

[kimwnasptd]

/lgtm