[docs]: Revamp embedchain docs (#799)

docs/data-sources/web-page.mdx

@@ -1,11 +1,13 @@
 ---
-title: 'Web page'
+title: '🌐📄 Web page'
 ---
 
-### Web page
-
 To add any web page, use the data_type as `web_page`. Eg:
 
 ```python
+from embedchain import App
+
+app = App()
+
 app.add('a_valid_web_page_url', data_type='web_page')
-```
+```