Black Lives Matter announcement

[grantr]

This work was done by @markusthoemmes, but since he's out I'm creating the PR. The text is the same as used in kubernetes/website#21505 and kubernetes-sigs/kubebuilder#1553.

Replaces #201 with my own branch since I can't push formatting fixes to Markus' original branch.

I verified this works with local Hugo.

/cc @evankanderson @mattmoor @tcnghia

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[mattmoor]

/lgtm

[evankanderson]

I'm not sure why, but you may need to merge f312680 yourself to get things working.

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[evankanderson]

/lgtm