Updated and fixed sorting algorithms

public/coding_challenges/sorting-visualiser/algo.js

...g_challenges/sorting-visualiser/algorithms/bubble-sort.js

...ges/sorting-visualiser/algorithms/cocktail-shaker-sort.js

..._challenges/sorting-visualiser/algorithms/fisher-yates.js

...ing_challenges/sorting-visualiser/algorithms/heap-sort.js

...ng_challenges/sorting-visualiser/algorithms/quick-sort.js

public/coding_challenges/sorting-visualiser/index.html

public/coding_challenges/sorting-visualiser/main.js

public/coding_challenges/sorting-visualiser/sorter.html

...ding_challenges/sorting-visualiser/visualisers/scatter.js