User-guide: migrate HostFirmwareSettings and FirmwareSchema API docs from BMO

[dtantsur]

We need to have user-facing content in the user guide. I suggest we have a single page for BIOS resources.

Migrate from https://github.com/metal3-io/baremetal-operator/blob/main/docs/api.md

/kind documentation
/triage accepted
/help

[metal3-io-bot]

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In response to this:

We need to have user-facing content in the user guide. I suggest we have a single page for BIOS resources.

Migrate from https://github.com/metal3-io/baremetal-operator/blob/main/docs/api.md

/kind documentation
/triage accepted
/help

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[metal3-io-bot]

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/lifecycle stale

[dtantsur]

/remove-lifecycle stale
/lifecycle frozen