[ImgBot] Optimize images

*Total -- 4,148.75kb -> 3,936.15kb (5.12%)

/pics/grid.jpg -- 145.49kb -> 126.00kb (13.39%)
/pics/elm/elm_arch.png -- 34.23kb -> 30.28kb (11.53%)
/pics/architecture/architecture_web_101.png -- 51.41kb -> 45.54kb (11.42%)
/pics/networking/OSI.png -- 74.31kb -> 66.12kb (11.02%)
/pics/database/database_normalization.jpg -- 27.94kb -> 25.66kb (8.15%)
/pics/startup/pricing/pricing_quadrants.jpg -- 97.63kb -> 90.29kb (7.51%)
/pics/startup/sales/sales_follow_up.jpg -- 101.10kb -> 93.55kb (7.47%)
/pics/startup/market_fit/market_fit_startup_stages.jpg -- 14.25kb -> 13.24kb (7.11%)
/pics/startup/sales/sales_cycle.jpg -- 79.16kb -> 73.55kb (7.09%)
/pics/startup/pricing/pricing_optimization.jpg -- 127.43kb -> 118.54kb (6.98%)
/pics/database/database_1nf.jpg -- 81.67kb -> 76.06kb (6.87%)
/pics/startup/pricing/pricing_rule.jpg -- 91.94kb -> 85.65kb (6.84%)
/pics/startup/mvp/mvp_airbnb.jpg -- 126.33kb -> 117.72kb (6.81%)
/pics/networking/TCPIP.jpg -- 110.08kb -> 102.89kb (6.53%)
/pics/database/database_many_to_many_1.jpg -- 55.21kb -> 51.76kb (6.24%)
/pics/startup/pricing/pricing_billion_formula.jpg -- 132.61kb -> 124.38kb (6.2%)
/pics/database/database_one_to_one_2.jpg -- 38.24kb -> 35.88kb (6.19%)
/pics/database/database_3nf.jpg -- 126.92kb -> 119.16kb (6.12%)
/pics/networking/ping.jpg -- 117.93kb -> 110.99kb (5.88%)
/pics/startup/mvp/mvp_stripe.jpg -- 129.27kb -> 121.69kb (5.86%)
/pics/startup/pricing/pricing_thermometer.jpg -- 88.86kb -> 83.79kb (5.7%)
/pics/breadboard.png -- 24.53kb -> 23.15kb (5.65%)
/pics/startup/mvp/mvp_twitch.jpg -- 157.19kb -> 148.32kb (5.65%)
/pics/startup/product_design/object_model.jpg -- 36.49kb -> 34.50kb (5.44%)
/pics/networking/data_flow.jpg -- 70.86kb -> 67.08kb (5.34%)
/pics/startup/sales/sales_conversations_phone.jpg -- 73.50kb -> 69.87kb (4.93%)
/pics/database/database_2nf.jpg -- 73.72kb -> 70.10kb (4.91%)
/pics/sql/pivot_unpivot.png -- 32.15kb -> 30.58kb (4.87%)
/pics/database/database_one_to_many_2.jpg -- 41.67kb -> 39.72kb (4.67%)
/pics/startup/pricing/pricing_sales_stages.jpg -- 69.72kb -> 66.49kb (4.63%)
/pics/startup/sales/sales_expectations.jpg -- 94.99kb -> 90.65kb (4.57%)
/pics/networking/http.jpg -- 129.31kb -> 123.52kb (4.48%)
/pics/startup/product_design/responsibilities.jpg -- 28.61kb -> 27.34kb (4.47%)
/pics/mvc_full_stack.jpg -- 106.37kb -> 101.72kb (4.37%)
/pics/arduino_led.jpg -- 74.53kb -> 71.32kb (4.31%)
/pics/database/database_denormalization.jpg -- 31.27kb -> 30.04kb (3.94%)
/pics/database/database_many_to_many_2.jpg -- 54.23kb -> 52.09kb (3.94%)
/pics/startup/mvp/mvp.jpg -- 34.88kb -> 33.58kb (3.73%)
/pics/database/database_one_to_one_1.jpg -- 29.95kb -> 28.89kb (3.53%)
/pics/database/database_one_to_many_1.jpg -- 52.99kb -> 51.21kb (3.35%)
/pics/electronics/khan_voltage.jpg -- 41.61kb -> 40.24kb (3.29%)
/pics/git/git_workflow.jpg -- 39.28kb -> 37.99kb (3.29%)
/pics/electronics/khan_current.jpg -- 59.85kb -> 58.06kb (2.99%)
/pics/networking/OSI_vs_TCPIP.jpg -- 80.83kb -> 78.95kb (2.32%)
/pics/startup/sales/sales_reality.jpg -- 94.44kb -> 92.45kb (2.11%)
/pics/js_event_loop.png -- 138.96kb -> 136.58kb (1.71%)
/pics/rfid_wiegand_arduino.jpg -- 40.12kb -> 39.43kb (1.7%)
/pics/express/express_middleware.jpg -- 50.31kb -> 49.51kb (1.58%)
/pics/architecture/architecture_c4model_scope.jpg -- 21.41kb -> 21.13kb (1.33%)
/pics/elm/TEA.png -- 431.85kb -> 427.89kb (0.92%)
/pics/inherit.jpg -- 24.84kb -> 24.76kb (0.34%)
/pics/architecture/architecture_c4model_maps.jpg -- 56.29kb -> 56.25kb (0.08%)

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