fix: remove default types for textAlign extension, fix #1430

There are no default types for TextAlign extension anymore. You have to configure by yourself. Usually something like:

```js
TextAlign.configure({
  types: ['heading', 'paragraph'],
})
```

docs/src/demos/Examples/Formatting/index.vue

@@ -63,7 +63,9 @@ export default {
     this.editor = new Editor({
       extensions: [
         StarterKit,
-        TextAlign,
+        TextAlign.configure({
+          types: ['heading', 'paragraph'],
+        }),
         Highlight,
       ],
       content: `