[ImgBot] Optimize images (#5519)

/content/en/blog/2019/dns-cert/architecture.png -- 118.26kb -> 98.01kb (17.13%)

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imgbot[bot] 2019-11-08 10:00:10 -08:00 committed by Martin Taillefer
parent c2c00f524a
commit 2bfc6c2bee
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