feat: One App (#635)

Co-authored-by: Taranjeet Singh <reachtotj@gmail.com>

docs/advanced/adding_data.mdx

@@ -4,13 +4,12 @@ title: '➕ Adding Data'
 
 ## Add Dataset
 
-- This step assumes that you have already created an `app` instance by either using `App`, `OpenSourceApp` or `CustomApp`. We are calling our app instance as `naval_chat_bot` 🤖
+- This step assumes that you have already created an `App`. We are calling our app instance as `naval_chat_bot` 🤖
 
 - Now use `.add` method to add any dataset.
 
 ```python
-# naval_chat_bot = App() or
-# naval_chat_bot = OpenSourceApp()
+naval_chat_bot = App()
 
 # Embed Online Resources
 naval_chat_bot.add("https://www.youtube.com/watch?v=3qHkcs3kG44")