Instantiate variables at top of functions or blocks?

[ASH-Bryan]

Our current JS standard says: "Instantiate variables at top of functions" but should it instead be at the top of blocks? I think this should be updated because of block scoped const and let.

[ASH-Michael]

Update standards to say that:

• var declarations must remain at top of function
• let and const declarations must be placed where they are the most restrictive