add area carpet fixture. Add carpet roll calculator test. refactor carpet roll as own component. add icons.

__fixtures__/initialProducts.ts

@@ -103,4 +103,11 @@ export default [
     type: "lumber",
     attributes: { name: "gutter spouts" },
   },
+  {
+    id: uuid.v4().valueOf(),
+    pricePerUnit: 0.75,
+    dimensions: { l: 1, w: 1, u: "ft" },
+    type: "area_rug",
+    attributes: { name: "area rug" },
+  },
 ] as Array<Product>;