[ImgBot] Optimize images

*Total -- 8,115.87kb -> 7,316.68kb (9.85%)

/images/tcie-3.x-input-for-db-dumps.png -- 17.95kb -> 7.13kb (60.29%)
/images/tcie-3.x-ssl-2.png -- 24.60kb -> 10.67kb (56.62%)
/images/TCIE-architecture1.png -- 13.06kb -> 5.72kb (56.25%)
/images/2019-07-settings-ssh-key.png -- 26.53kb -> 11.61kb (56.23%)
/images/tcie-3.x-default-build-env.png -- 15.51kb -> 7.05kb (54.53%)
/images/tcie-3.x-core-services-graph.png -- 48.60kb -> 23.31kb (52.04%)
/images/TCIE-Architecture2.png -- 23.18kb -> 11.35kb (51.06%)
/images/2019-07-settings-env-vars.png -- 153.42kb -> 77.10kb (49.75%)
/user/images/P4_SVN_TCI_drawing.png -- 125.60kb -> 70.24kb (44.08%)
/images/tcie-3.x-setting-up-Port.png -- 493.46kb -> 303.82kb (38.43%)
/images/vcs.png -- 33.01kb -> 21.66kb (34.41%)
/images/ui/icon-flag.svg -- 0.50kb -> 0.35kb (29.71%)
/images/2019-04-15-xenial-build-log.png -- 26.64kb -> 19.07kb (28.42%)
/images/tcie-3.x-workspaces-config.png -- 215.57kb -> 154.86kb (28.16%)
/images/tcie-3.x-input-for-encryption-key.png -- 15.02kb -> 10.97kb (26.95%)
/images/tcie-3.x-self-hosted-db.png -- 55.22kb -> 40.43kb (26.78%)
/images/ui/icon-arrowtabs.svg -- 0.56kb -> 0.41kb (26.49%)
/user/images/oss-migration/repos-to-migrate.png -- 38.22kb -> 28.42kb (25.66%)
/images/tcie-3.x-setting-up-OAuth.png -- 319.08kb -> 242.12kb (24.12%)
/images/error/404-hills-left.svg -- 1.18kb -> 0.90kb (23.76%)
/images/tcie-3.x-check-updates.png -- 25.24kb -> 19.28kb (23.59%)
/images/error/404-hills-right.svg -- 1.67kb -> 1.32kb (20.52%)
/images/ui/search.svg -- 1.31kb -> 1.05kb (19.99%)
/images/tcie-3.x-setting-up-Secret.png -- 302.23kb -> 242.66kb (19.71%)
/images/tcie-3.x-setting-up-License.png -- 81.37kb -> 67.65kb (16.85%)
/images/tcie-3.x-setting-up-RSA.png -- 475.39kb -> 415.58kb (12.58%)
/images/tcie-3.x-ssl-1.png -- 49.96kb -> 43.84kb (12.25%)
/images/ui/travis-logo.svg -- 2.52kb -> 2.22kb (12.19%)
/images/tcie-3.x-setting-up-Header.png -- 64.81kb -> 56.95kb (12.13%)
/images/ui/docs-desktop.svg -- 84.21kb -> 76.09kb (9.65%)
/images/tcie-3.x-list-of-versions.png -- 40.59kb -> 37.36kb (7.95%)
/images/apps/buildpulse.png -- 17.00kb -> 15.90kb (6.52%)
/images/ui/cones.svg -- 4.90kb -> 4.63kb (5.52%)
/slate/source/fonts/icomoon.svg -- 5.25kb -> 5.01kb (4.72%)
/images/error/pensive-travis.svg -- 30.79kb -> 29.44kb (4.4%)
/images/migrate/sign-up-for-the-beta-to-migrate.png -- 106.09kb -> 102.61kb (3.28%)
/images/error/excavator.svg -- 26.65kb -> 25.84kb (3.05%)
/images/ui/footer-logo.svg -- 49.62kb -> 48.58kb (2.11%)
/images/logo.svg -- 3.50kb -> 3.46kb (1.14%)
/images/hiro-animated.gif -- 497.66kb -> 492.89kb (0.96%)
/images/Timeline4.jpg -- 711.24kb -> 707.41kb (0.54%)
/images/Timeline3.jpg -- 705.22kb -> 701.57kb (0.52%)
/images/Timeline6.jpg -- 705.38kb -> 701.86kb (0.5%)
/images/Timeline2.jpg -- 702.88kb -> 699.78kb (0.44%)
/images/Timeline1.jpg -- 697.58kb -> 694.58kb (0.43%)
/images/Timeline5.jpg -- 699.63kb -> 696.66kb (0.42%)
/images/tcie-3.x-setting-up-JSON.png -- 245.66kb -> 244.99kb (0.27%)
/images/tcie-3.x-setting-up-Details.png -- 117.04kb -> 116.78kb (0.23%)
/images/tcie-3.x-setting-up-loadbalancer.svg -- 13.55kb -> 13.54kb (0.06%)

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