[ImgBot] Optimize images

*Total -- 1,434.46kb -> 1,049.05kb (26.87%)

/tests/fixtures/avatar.png -- 9.51kb -> 2.65kb (72.09%)
/webcompat/static/img/contributors/site-outreach_2-slideshare.png -- 334.35kb -> 231.15kb (30.87%)
/webcompat/static/img/contributors/site-outreach_3-dribbble.png -- 939.24kb -> 669.63kb (28.7%)
/webcompat/static/img/svg/icons/svg-subproblem-empty-page.svg -- 1.07kb -> 0.77kb (27.93%)
/webcompat/static/favicon/favicon-32x32.png -- 0.77kb -> 0.66kb (14.92%)
/webcompat/static/img/svg/icons/svg-problem-question.svg -- 0.60kb -> 0.52kb (13.73%)
/webcompat/static/img/svg/icons/svg-subproblem-items-not-visible.svg -- 2.78kb -> 2.41kb (13.43%)
/webcompat/static/img/svg/icons/svg-problem-mobile-vs-desktop.svg -- 0.58kb -> 0.51kb (11.93%)
/webcompat/static/img/svg/icons/svg-checkmark.svg -- 0.79kb -> 0.70kb (11.84%)
/webcompat/static/img/svg/icons/svg-subproblem-misaligned.svg -- 0.44kb -> 0.39kb (11.78%)
/webcompat/static/img/svg/icons/svg-problem-broken-design.svg -- 0.38kb -> 0.33kb (11.46%)
/webcompat/static/img/svg/icons/svg-bug-animated.svg -- 2.32kb -> 2.06kb (11.11%)
/webcompat/static/img/svg/icons/svg-subproblem-overlapping.svg -- 0.76kb -> 0.67kb (10.95%)
/webcompat/static/img/svg/icons/svg-add-image.svg -- 1.83kb -> 1.65kb (10.07%)
/webcompat/static/img/svg/icons/svg-subproblem-items-missing.svg -- 1.09kb -> 0.99kb (9.11%)
/webcompat/static/img/svg/icons/svg-info-icon.svg -- 0.48kb -> 0.44kb (8.91%)
/webcompat/static/img/svg/icons/svg-other.svg -- 1.92kb -> 1.75kb (8.62%)
/tests/fixtures/green_square.gif -- 0.09kb -> 0.08kb (8.6%)
/webcompat/static/img/svg/icons/svg-valid.svg -- 0.70kb -> 0.64kb (8.57%)
/webcompat/static/img/svg/icons/svg-cross2.svg -- 1.13kb -> 1.03kb (8.33%)
/webcompat/static/img/svg/icons/svg-problem-no-use.svg -- 0.42kb -> 0.39kb (8.14%)
/webcompat/static/img/svg/icons/svg-subproblem-no-images.svg -- 0.60kb -> 0.56kb (7.17%)
/webcompat/static/img/svg/icons/svg-problem-no-video.svg -- 0.66kb -> 0.61kb (6.56%)
/webcompat/static/img/svg/icons/svg-subproblem-does-not-play.svg -- 0.74kb -> 0.70kb (6.32%)
/webcompat/static/img/svg/icons/svg-menu2.svg -- 0.38kb -> 0.35kb (6.25%)
/webcompat/static/img/svg/help-step-3.svg -- 6.94kb -> 6.51kb (6.18%)
/webcompat/static/img/svg/icons/svg-subproblem-no-video.svg -- 0.76kb -> 0.72kb (6.15%)
/webcompat/static/img/svg/icons/svg-subproblem-cant-click.svg -- 0.63kb -> 0.59kb (6.08%)
/webcompat/static/img/svg/icons/svg-subproblem-missing-controls.svg -- 0.67kb -> 0.64kb (5.65%)
/webcompat/static/img/svg/icons/svg-subproblem-unsupported.svg -- 0.86kb -> 0.82kb (5.43%)
/webcompat/static/img/svg/icons/svg-subproblem-cant-type.svg -- 0.73kb -> 0.69kb (5.25%)
/webcompat/static/img/svg/icons/svg-subproblem--no-audio.svg -- 0.74kb -> 0.70kb (5.16%)
/webcompat/static/img/svg/icons/svg-subproblem-cant-login.svg -- 0.75kb -> 0.71kb (5.11%)
/webcompat/static/img/svg/icons/svg-sliders.svg -- 0.90kb -> 0.86kb (4.78%)
/webcompat/static/img/svg/icons/svg-link-2.svg -- 0.49kb -> 0.47kb (4.77%)
/webcompat/static/img/svg/icons/svg-minus.svg -- 0.21kb -> 0.20kb (4.69%)
/webcompat/static/img/svg/icons/svg-step-arrow.svg -- 0.26kb -> 0.25kb (4.51%)
/webcompat/static/img/svg/icons/svg-arrowhead-right.svg -- 0.28kb -> 0.27kb (4.23%)
/webcompat/static/img/svg/icons/svg-user.svg -- 0.40kb -> 0.38kb (4.16%)
/webcompat/static/img/svg/icons/svg-users.svg -- 0.77kb -> 0.74kb (3.91%)
/webcompat/static/img/svg/icons/svg-pin.svg -- 0.30kb -> 0.29kb (3.9%)
/webcompat/static/img/svg/icons/svg-circle-up.svg -- 0.43kb -> 0.42kb (3.82%)
/webcompat/static/img/svg/icons/svg-circle-left.svg -- 0.44kb -> 0.42kb (3.79%)
/webcompat/static/img/svg/icons/svg-circle-right.svg -- 0.44kb -> 0.42kb (3.79%)
/webcompat/static/img/svg/help-step-2.svg -- 5.73kb -> 5.51kb (3.72%)
/webcompat/static/img/svg/icons/svg-circle-down.svg -- 0.46kb -> 0.44kb (3.63%)
/webcompat/static/img/svg/icons/svg-plus.svg -- 0.27kb -> 0.26kb (3.6%)
/webcompat/static/img/svg/icons/svg-chevrons-right.svg -- 0.46kb -> 0.45kb (3.58%)
/webcompat/static/img/svg/icons/svg-warning.svg -- 0.67kb -> 0.64kb (3.52%)
/webcompat/static/img/svg/icons/svg-target.svg -- 0.67kb -> 0.65kb (3.48%)
/webcompat/static/favicon/safari-pinned-tab.svg -- 4.34kb -> 4.19kb (3.38%)
/webcompat/static/img/svg/help-step-1.svg -- 7.53kb -> 7.28kb (3.35%)
/webcompat/static/img/svg/icons/svg-check.svg -- 0.29kb -> 0.28kb (3.34%)
/webcompat/static/img/svg/icons/svg-cross-black.svg -- 0.35kb -> 0.34kb (3.33%)
/webcompat/static/img/svg/icons/svg-cross-white.svg -- 0.35kb -> 0.34kb (3.33%)
/webcompat/static/img/svg/icons/svg-check-issue.svg -- 0.35kb -> 0.34kb (3.33%)
/webcompat/static/img/svg/icons/svg-question-mark.svg -- 1.82kb -> 1.76kb (3.32%)
/webcompat/static/img/svg/icons/svg-chevron-right.svg -- 0.30kb -> 0.29kb (3.29%)
/webcompat/static/img/svg/icons/svg-checkbox-unchecked.svg -- 0.30kb -> 0.29kb (3.23%)
/webcompat/static/img/svg/icons/svg-download2.svg -- 0.53kb -> 0.51kb (3.13%)
/webcompat/static/img/svg/icons/svg-log-in.svg -- 0.53kb -> 0.51kb (3.13%)
/webcompat/static/img/svg/icons/svg-log-out.svg -- 0.54kb -> 0.52kb (3.1%)
/webcompat/static/img/svg/icons/svg-bulb.svg -- 4.65kb -> 4.50kb (3.09%)
/webcompat/static/img/svg/cheering-people.svg -- 4.50kb -> 4.36kb (2.98%)
/webcompat/static/img/svg/icons/svg-radio-checked2.svg -- 0.33kb -> 0.32kb (2.93%)
/webcompat/static/img/svg/icons/svg-external-link.svg -- 0.57kb -> 0.55kb (2.91%)
/webcompat/static/img/svg/icons/svg-radio-unchecked.svg -- 0.35kb -> 0.34kb (2.82%)
/webcompat/static/font/webcompat/webcompat.svg -- 11.33kb -> 11.01kb (2.79%)
/webcompat/static/img/svg/icons/svg-arrow-down.svg -- 0.38kb -> 0.37kb (2.59%)
/webcompat/static/img/svg/icons/svg-checkbox-checked.svg -- 0.38kb -> 0.38kb (2.54%)
/webcompat/static/img/svg/icons/svg-home.svg -- 0.39kb -> 0.38kb (2.48%)
/webcompat/static/img/svg/icons/svg-message-square.svg -- 0.39kb -> 0.38kb (2.48%)
/webcompat/static/img/svg/icons/svg-x.svg -- 0.39kb -> 0.38kb (2.48%)
/webcompat/static/img/svg/icons/svg-mail.svg -- 0.40kb -> 0.39kb (2.43%)
/webcompat/static/img/svg/icons/svg-left.svg -- 0.76kb -> 0.75kb (2.18%)
/webcompat/static/img/svg/icons/svg-filter.svg -- 0.45kb -> 0.44kb (2.17%)
/webcompat/static/img/svg/icons/svg-up.svg -- 0.77kb -> 0.75kb (2.17%)
/webcompat/static/img/svg/icons/svg-search2.svg -- 0.46kb -> 0.45kb (2.11%)
/webcompat/static/img/svg/icons/svg-radio-checked.svg -- 0.46kb -> 0.46kb (2.1%)
/webcompat/static/img/svg/devices.svg -- 6.84kb -> 6.69kb (2.1%)
/webcompat/static/img/svg/icons/svg-zap.svg -- 0.54kb -> 0.53kb (1.82%)
/webcompat/static/img/svg/icons/svg-cloud2.svg -- 0.55kb -> 0.54kb (1.79%)
/webcompat/static/img/svg/icons/svg-at-sign.svg -- 0.55kb -> 0.54kb (1.78%)
/webcompat/static/img/svg/icons/svg-hash.svg -- 0.60kb -> 0.59kb (1.63%)
/webcompat/static/img/svg/icons/svg-leaf_right.svg -- 5.87kb -> 5.78kb (1.6%)
/webcompat/static/img/svg/icons/svg-leaf_left.svg -- 5.89kb -> 5.79kb (1.59%)
/webcompat/static/img/svg/icons/svg-spinner8.svg -- 0.63kb -> 0.62kb (1.56%)
/webcompat/static/img/svg/icons/svg-upload-2.svg -- 1.07kb -> 1.05kb (1.55%)
/webcompat/static/img/svg/icons/svg-download.svg -- 1.07kb -> 1.05kb (1.55%)
/webcompat/static/img/svg/reporting-people.svg -- 16.43kb -> 16.17kb (1.55%)
/webcompat/static/img/svg/icons/svg-edge.svg -- 0.52kb -> 0.52kb (1.31%)
/webcompat/static/img/svg/icons/svg-github-white.svg -- 0.90kb -> 0.89kb (1.3%)
/webcompat/static/img/svg/describe-issue.svg -- 6.20kb -> 6.12kb (1.26%)
/webcompat/static/img/svg/icons/svg-bug.svg -- 0.78kb -> 0.77kb (1.26%)
/webcompat/static/img/svg/icons/svg-arrow.svg -- 0.81kb -> 0.80kb (1.21%)
/webcompat/static/img/svg/icons/svg-twitter.svg -- 0.86kb -> 0.85kb (1.14%)
/webcompat/static/img/svg/icons/svg-chrome.svg -- 0.67kb -> 0.66kb (1.02%)
/webcompat/static/img/svg/icons/svg-opera.svg -- 0.74kb -> 0.73kb (0.93%)
/webcompat/static/img/svg/icons/svg-github2.svg -- 1.08kb -> 1.07kb (0.91%)
/webcompat/static/img/svg/icons/svg-settings.svg -- 1.85kb -> 1.83kb (0.9%)
/webcompat/static/img/svg/icons/svg-ie.svg -- 1.03kb -> 1.02kb (0.67%)
/webcompat/static/img/svg/icons/svg-subproblem-captcha.svg -- 4.47kb -> 4.44kb (0.66%)
/webcompat/static/img/svg/icons/svg-safari.svg -- 1.47kb -> 1.46kb (0.47%)

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