"Favourites" gets cleared after refreshing the favourites page

[ebiggerr]

Refreshing the favourites page will clear the array of favourites. Causing the page to display nothing.

[ebiggerr]

figuring to implement data persistence

[ebiggerr]

figuring to implement data persistence

storing the array in localStorage. Deep copy and update the array when there is new coin added into the favourites or removed from favourites.