feat: add pixel art cursor

Add two png files for the cursor, one to
represent the default cursor and the other
one to be a pointer cursor.

Add the default one for the html tag. And
a `inherited` property for label tag.

The pointer one is being added on the button,
radio, checkbox and a tags.

scss/elements/buttons.scss

@@ -24,7 +24,7 @@
   margin: $border-size;
   text-align: center;
   vertical-align: middle;
-  cursor: pointer;
+  cursor: $cursor-click-url, pointer;
   user-select: none;
 
   @include btn-style($base-color, #fff, #e7e7e7, #adafbc);