Refactor goods objects into arrays

goodsAndServices.js has a goods value for every entry, which should be refactored into an array.

e.g.

goods: {
        'short boots': {
          cost: 10,
          description: 'A pair of barely ankle height boots made of some kind of leather'
        },

should become

goods: [
        {
          summary: 'short boots',
          cost: 10,
          description: 'A pair of barely ankle height boots made of some kind of leather'
        },

This would involve a minor refactoring of the <<goods>> widget located in Widgets.twee.

[ryceg]

Please do @alcar!

[alcar]

Sorry @femakin, I’m already working on it 🙁