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/Extensions/TextAlign/index.vue

@@ -45,7 +45,9 @@ export default {
         Paragraph,
         Text,
         Heading,
-        TextAlign,
+        TextAlign.configure({
+          types: ['heading', 'paragraph'],
+        }),
       ],
       content: `
         <h2>Heading</h2>