Generate local API documentation from CRDs

[tuminoid]

We have some old docs/api.md that explains some things and points to external service for API documentation.

Consider taking in metal3-io/ironic-standalone-operator#281 from IRSO for local API documentation and check what parts of the old documentation to keep and what to merge.

/kind documentation

[Rozzii]

/triage accepted

[metal3-io-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues will close after an additional 30d of inactivity.

If this issue is safe to close now please do so with /close.

/lifecycle stale

[Rozzii]

/remove-lifecycle stale

[metal3-io-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues will close after an additional 30d of inactivity.

If this issue is safe to close now please do so with /close.

/lifecycle stale

[Rozzii]

/remove-lifecycle stale

[peppi-lotta]

/help
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[metal3-io-bot]

@peppi-lotta:
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Please ensure the request meets the requirements listed here.

If this request no longer meets these requirements, the label can be removed
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