UI improvement: Ability to checkmark ingredients

[ptoulouse]

It would be nice to have the ability to put a checkmark on the ingredients as they are prepared or added to the recipe.

It could be a checkmark similar to what is available for the instructions. Or it could be that the ingredients are striked through and grayed out, so that it is more striking visually. Example (I cannot reproduce the gray out):

• ¼ cup unsalted butter at room temperature
• 6 Tbsp packed dark brown sugar
• ¼ cup fancy molasses
• 1 large egg at room temperature
• 1 1/2 cups + 2 Tbsp all-purpose flour