Page creation basics (#7)

* Page cration basics

* remove unused code

* add client-side Header validation

* remove static method

* rm await duplication

src/frontend/js/classes/editor.js

@@ -1,7 +1,42 @@
 import CodeXEditor from 'codex.editor';
+import Header from 'codex.editor.header';
 
+/**
+ * Class for working with Editor.js
+ */
 export default class Editor {
+  /**
+   * Creates Editor instance
+   */
   constructor() {
-    this.editor = new CodeXEditor();
+    this.editor = new CodeXEditor({
+      tools: {
+        header: {
+          class: Header,
+          config: {
+            placeholder: 'Enter a title'
+          }
+        }
+      },
+      data: {
+        blocks: [
+          {
+            type: 'header',
+            data: {
+              text: '',
+              level: 2
+            }
+          }
+        ]
+      }
+    });
+  }
+
+  /**
+   * Return Editor data
+   * @return {Promise.<{}>}
+   */
+  save() {
+    return this.editor.saver.save();
   }
 }