[ImgBot] Optimize images

*Total -- 1,254.67kb -> 1,030.04kb (17.9%)

/docs/diagrams/cwlviewer_flowchat_02.png -- 243.14kb -> 176.46kb (27.42%)
/docs/diagrams/cwlviewer_flowchat_03.png -- 268.41kb -> 197.36kb (26.47%)
/src/main/resources/static/img/CWL-Logo-nofonts.svg -- 31.22kb -> 23.37kb (25.16%)
/src/main/resources/static/img/loading.svg -- 3.80kb -> 2.95kb (22.49%)
/src/main/resources/static/bower_components/svg-pan-zoom/demo/pathway.svg -- 32.26kb -> 26.37kb (18.26%)
/src/main/resources/static/img/manchester.svg -- 22.11kb -> 18.07kb (18.25%)
/docs/diagrams/cwlviewer_flowchat_01.png -- 316.24kb -> 261.06kb (17.45%)
/src/main/resources/static/img/workflow-compile.svg -- 6.98kb -> 5.90kb (15.57%)
/src/main/resources/static/img/BioExcel_logo_cropped.svg -- 5.10kb -> 4.35kb (14.64%)
/src/test/resources/graphviz/testVis.svg -- 12.16kb -> 10.53kb (13.35%)
/src/main/resources/static/bower_components/svg-pan-zoom/src/media/reset.svg -- 2.59kb -> 2.27kb (12.61%)
/src/main/resources/static/img/Flag_of_Europe.svg -- 1.10kb -> 0.96kb (12.51%)
/src/main/resources/static/img/tick.svg -- 0.37kb -> 0.33kb (9.04%)
/src/main/resources/static/img/cross.svg -- 0.41kb -> 0.37kb (8.15%)
/src/main/resources/static/bower_components/jquery-svg/lion.svg -- 17.87kb -> 16.57kb (7.29%)
/src/main/resources/static/bower_components/svg-pan-zoom/svg-pan-zoom-logo.svg -- 10.16kb -> 9.50kb (6.48%)
/src/main/resources/static/img/parents-logo.svg -- 0.71kb -> 0.67kb (5.36%)
/src/main/resources/static/img/children-logo.svg -- 0.61kb -> 0.58kb (4.98%)
/src/main/resources/static/bower_components/svg-pan-zoom/demo/tiger.svg -- 67.06kb -> 64.53kb (3.77%)
/src/main/resources/static/bower_components/bootstrap/dist/fonts/glyphicons-halflings-regular.svg -- 106.19kb -> 103.92kb (2.14%)
/src/main/resources/static/bower_components/bootstrap/fonts/glyphicons-halflings-regular.svg -- 106.19kb -> 103.92kb (2.14%)

Signed-off-by: ImgBotApp <ImgBotHelp@gmail.com>

Author: ImgBotApp