Fix redirect links in _posts/2019-09-11-Baremetal-operator.md

[tuminoid]

The link checker found URLs that redirect to new locations. These should be updated to point directly to the correct URLs:

Current URL	Redirects To
https://github.com/metal3-io/baremetal-operator/blob/master/docs/api.md	https://github.com/metal3-io/baremetal-operator/blob/main/docs/api.md
https://github.com/metal3-io/metal3-docs/blob/master/design/use-ironic.md	https://github.com/metal3-io/metal3-docs/blob/main/design/use-ironic.md

Related to #588

/triage accepted
/help
/good-first-issue

[metal3-io-bot]

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Details

In response to this:

The link checker found URLs that redirect to new locations. These should be updated to point directly to the correct URLs:

Current URL	Redirects To
https://github.com/metal3-io/baremetal-operator/blob/master/docs/api.md	https://github.com/metal3-io/baremetal-operator/blob/main/docs/api.md
https://github.com/metal3-io/metal3-docs/blob/master/design/use-ironic.md	https://github.com/metal3-io/metal3-docs/blob/main/design/use-ironic.md

Related to #588

/triage accepted
/help
/good-first-issue

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