Update AVL tree path

Issue #244
Old path: ../../JSAV/extras/AVLextension.js
New path: ../DS/AVLextension.js
Update binary heap file path in AV directory

Issue #244
Old path: ../../JSAV/extras/binaryheap.js
New path: ../DS/binaryheap.js
Update binary heap file path in Exercises directory

Issue #244
Old path: ../../JSAV/extras/binaryheap.js
New path: ../../AV/DS/binaryheap.js
Update binary heap file path in RST dicrectory

Issue #244
Old path: JSAV/extras/binaryheap.js
New path: AV/DS/binaryheap.js
Update huffman tree file path

Issue #244
Updates both the JS and CSS file paths.
Update read black tree file path

Issue #244
Old path: ../../JSAV/extras/redblacktree.js
New path: ../DS/redblacktree.js
Move Array tree data structure to AV/DS directory

Issue #244
Update Array tree file path

Isue #244
Update both JS and CSS file paths