Use crd-ref-docs for API reference documentation generation
#246
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similar to PR#563 for metal-operator this replaces the outdated
github.com/ahmetb/gen-crd-api-reference-docs(v0.3.0, last updated 2020) withgithub.com/elastic/crd-ref-docs(v0.2.0).also removes obsolete templates, changes config format to yaml.