[ImgBot] Optimize images

*Total -- 148.10kb -> 105.72kb (28.61%)

/solution/1500-1599/1591.Strange Printer II/images/sample_1_1929.png -- 13.58kb -> 4.34kb (68.04%)
/solution/1500-1599/1591.Strange Printer II/images/sample_2_1929.png -- 26.17kb -> 8.50kb (67.52%)
/solution/1500-1599/1579.Remove Max Number of Edges to Keep Graph Fully Traversable/images/5510ex3.png -- 6.39kb -> 3.60kb (43.67%)
/solution/1500-1599/1579.Remove Max Number of Edges to Keep Graph Fully Traversable/images/5510ex1.png -- 7.43kb -> 4.78kb (35.61%)
/solution/1500-1599/1579.Remove Max Number of Edges to Keep Graph Fully Traversable/images/5510ex2.png -- 8.32kb -> 5.39kb (35.17%)
/solution/1500-1599/1599.Maximum Profit of Operating a Centennial Wheel/images/wheeldiagram12.png -- 24.05kb -> 21.46kb (10.77%)
/solution/1500-1599/1598.Crawler Log Folder/images/sample_22_1957.png -- 19.42kb -> 17.35kb (10.63%)
/solution/1500-1599/1598.Crawler Log Folder/images/sample_11_1957.png -- 13.00kb -> 11.62kb (10.62%)
/solution/1500-1599/1595.Minimum Cost to Connect Two Groups of Points/images/ex2.jpg -- 19.19kb -> 18.40kb (4.09%)
/solution/1500-1599/1595.Minimum Cost to Connect Two Groups of Points/images/ex1.jpg -- 10.56kb -> 10.27kb (2.7%)

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