[ImgBot] Optimize images

*Total -- 3,115.47kb -> 3,071.41kb (1.41%)

/Arrays/imgs/stock.jpg -- 273.04kb -> 263.23kb (3.59%)
/Queue/imgs/queue_array.jpg -- 205.03kb -> 198.62kb (3.13%)
/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%)
/LinkedList/imgs/reverse_list_recursive.jpg -- 88.46kb -> 86.93kb (1.73%)
/Sorting/imgs/merge_sort.jpg -- 302.34kb -> 300.09kb (0.75%)
/LinkedList/imgs/reverse_list_itr.jpg -- 81.00kb -> 80.42kb (0.72%)
/Sorting/imgs/quick_sort.jpg -- 279.06kb -> 277.36kb (0.61%)
/Sorting/imgs/bubble_sort.jpg -- 316.86kb -> 315.27kb (0.5%)
/Sorting/imgs/selection_sort.jpg -- 265.80kb -> 265.51kb (0.11%)
/Sorting/imgs/dutch_national_flag.jpg -- 328.50kb -> 328.45kb (0.01%)

Signed-off-by: ImgBotApp <[email protected]>