[ImgBot] Optimize images

*Total -- 4,776.07kb -> 4,683.08kb (1.95%)

/Graph/imgs/list_vs_matrix.jpg -- 211.50kb -> 201.09kb (4.92%)
/Graph/BFS/BFS_ques.jpg -- 176.20kb -> 168.83kb (4.18%)
/Trees/printKthNode/printKthNode_dryrun.jpg -- 146.76kb -> 140.78kb (4.08%)
/Arrays/imgs/stock.jpg -- 273.04kb -> 263.23kb (3.59%)
/DynamicProgramming/imgs/3.jpg -- 271.18kb -> 261.52kb (3.56%)
/Queue/imgs/queue_array.jpg -- 205.03kb -> 198.62kb (3.13%)
/Trees/printKthNode/printKthNode_ques.jpg -- 112.94kb -> 110.08kb (2.53%)
/Stack/imgs/prev_greater_el.jpg -- 172.94kb -> 168.79kb (2.4%)
/LinkedList/imgs/cycle_detection_and_removal.jpg -- 186.87kb -> 182.78kb (2.19%)
/LinkedList/imgs/LRU_cache_design_1.jpg -- 254.15kb -> 248.76kb (2.12%)
/Sorting/imgs/insertion_sort.jpg -- 298.25kb -> 292.29kb (2%)
/Sorting/imgs/optimised_bsort.jpg -- 236.10kb -> 231.70kb (1.86%)
/Stack/imgs/next_greater_el.jpg -- 312.78kb -> 307.13kb (1.8%)
/LinkedList/imgs/reverse_list_recursive.jpg -- 88.46kb -> 86.93kb (1.73%)
/DynamicProgramming/imgs/4.jpg -- 202.76kb -> 199.57kb (1.57%)
/Sorting/imgs/merge_sort.jpg -- 302.34kb -> 300.09kb (0.75%)
/Sorting/imgs/quick_sort.jpg -- 279.06kb -> 277.36kb (0.61%)
/Sorting/imgs/bubble_sort.jpg -- 316.86kb -> 315.27kb (0.5%)
/DynamicProgramming/imgs/6.jpg -- 134.54kb -> 134.29kb (0.19%)
/Sorting/imgs/selection_sort.jpg -- 265.80kb -> 265.51kb (0.11%)
/Sorting/imgs/dutch_national_flag.jpg -- 328.50kb -> 328.45kb (0.01%)

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