WIP: Revert "introduction of custom iPXE firmware support"

[kashifest]

Reverts metal3-io/ironic-image#429

[metal3-io-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[kashifest]

/test-ubuntu-integration-main

[tuminoid]

I think we can close this as #463 landed and fixed the repo?

[metal3-io-bot]

PR needs rebase.

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[kashifest]

/close

[metal3-io-bot]

@kashifest: Closed this PR.

In response to [this](https://github.com/metal3-io/ironic-image/pull/462#issuecomment-1862293925): >/close 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.