added reactions to reviews and wishlist

so today I already began working on bigger features.
It was a bit hard to do all off this but I made it.
I just found out today that you can actually migrate databases wth Flask.
I always thought I had to delete the hole database and set it up again to make everything work.

Also I spent around 4 hours searching for a mistake just to find out that I linked the wrong javascript file.

My backend code gets worse every day. I must find a solution for that.
Here my new wishlist page and the reactions: