Remove Item class and its associated methods

src/item.js

@@ -1,28 +0,0 @@
-class Item {
-  static get TYPES() {
-    return ["text", "radio", "checkbox", "scale"];
-  }
-
-  constructor({type, title, optTexts, optValues = null}) {
-    this._title = title;
-    this._type = type;
-    this._texts = optTexts;
-    this._values = optValues;
-    this._response = null;
-  }
-
-  static isValid({type, title, optTexts, optValues = null}) {
-    if (!title || !Item.TYPES.includes(type)) {
-      return false;
-    }
-    if (type === "text") {
-      return true;
-    }
-    if (optTexts && optValues && optTexts.length !== optValues.length) {
-      return false;
-    }
-    return true;
-  }
-}
-
-export default Item;