CD-17: Add/remove ingredients one by one

[thucngyyen]

• When users add/edit private recipe, ingredients need to be added one by one in stead of separated lines in one text.
• Each row of ingredient should have: ingredient name, calories, unit, measurements (unit and measurement can be combined🤔)
• This requires changes on:
  • [ ] private_recipe collection in firebase
  • [ ] public_recipe collection for later feature that adds public_recipe to private_recipe
  • [ ] templateAddRecipe.html and templateAddRecipe.js: need add/remove button on each ingredient
  • [ ] templateEditRecipe.html and templateEditRecipe.js: need add/remove button on each ingredient