build: improved main makefile

[ssbarnea]

• added .install.md2man as dependency for docs, fixed broken build
  on systems that do not have go-md2man preinstalled.
• sorted PHONY targets

Signed-off-by: Sorin Sbarnea [email protected]

[openshift-ci-robot]

Hi @ssbarnea. Thanks for your PR.

I'm waiting for a containers member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[ssbarnea]

/ok-to-test

[TomSweeneyRedHat]

/approve

[TomSweeneyRedHat]

/ok-to-test

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ssbarnea, TomSweeneyRedHat

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[TomSweeneyRedHat]

LGTM, thanks muchly @ssbarnea !

[rhatdan]

.

[rhatdan]

/lgtm

[mheon]

/lgtm

[rhatdan]

@ssbarnea Could you fix the issue @edsantiago is referencing. We should use the go-md2man on the system if it exists and then fall back to the local version, which might allow us to satisfy both needs.