[docs]: Revamp embedchain docs (#799)

docs/data-sources/mdx.mdx

@@ -1,12 +1,14 @@
 ---
-title: 'Mdx'
+title: '📝 Mdx file'
 ---
 
-
-### Mdx file
-
-To add any mdx file to your app, use the data_type (first argument to `.add()` method) as `mdx`. Note that this supports support mdx file present on machine, so this should be a file path. Eg:
+To add any `.mdx` file to your app, use the data_type (first argument to `.add()` method) as `mdx`. Note that this supports support mdx file present on machine, so this should be a file path. Eg:
 
 ```python
+from embedchain import App
+
+app = App()
 app.add('path/to/file.mdx', data_type='mdx')
-```
+
+app.query("What are the docs about?")
+```