[ImgBot] Optimize images - #1

*Total -- 921.03kb -> 788.96kb (14.34%)

/Documentation/networking/resolv-conf-logic.png -- 52.04kb -> 20.08kb (61.41%)
/Documentation/rkt-vs-docker-fetch.png -- 123.44kb -> 68.88kb (44.2%)
/logos/rkt-glyph-color.png -- 6.03kb -> 3.43kb (43.06%)
/logos/rkt-horizontal-bw.png -- 3.09kb -> 1.88kb (39.17%)
/Documentation/rkt-vs-docker-process-model.png -- 36.86kb -> 24.86kb (32.56%)
/logos/rkt-horizontal-white.png -- 2.87kb -> 2.17kb (24.52%)
/Documentation/devel/execution-flow-fly.png -- 19.40kb -> 15.94kb (17.82%)
/logos/rkt-horizontal-white.svg -- 2.24kb -> 1.86kb (17.17%)
/logos/rkt-horizontal-bw.svg -- 2.16kb -> 1.80kb (16.97%)
/logos/rkt-horizontal-color.svg -- 2.19kb -> 1.83kb (16.74%)
/Documentation/devel/execution-flow.png -- 18.53kb -> 15.54kb (16.16%)
/Documentation/devel/execution-flow-systemd.png -- 41.85kb -> 36.03kb (13.91%)
/Documentation/devel/image-logical-blocks.png -- 8.34kb -> 7.22kb (13.43%)
/Documentation/devel/image-chain.png -- 2.99kb -> 2.59kb (13.34%)
/Documentation/devel/mutable.png -- 40.85kb -> 36.82kb (9.87%)
/Documentation/devel/mutable-app.png -- 68.05kb -> 61.70kb (9.34%)
/Documentation/subcommands/api-service.svg -- 48.44kb -> 47.72kb (1.49%)
/Documentation/sd_notify-background.svg -- 47.98kb -> 47.58kb (0.84%)
/Documentation/rkt-systemd-interaction.svg -- 103.52kb -> 102.70kb (0.8%)
/Documentation/devel/rkt-process-model.svg -- 72.88kb -> 72.35kb (0.73%)
/Documentation/sd_notify-propagation.svg -- 82.04kb -> 81.52kb (0.63%)
/Documentation/devel/rkt-process-model-with-systemd.svg -- 135.23kb -> 134.49kb (0.55%)

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