[Refactor] Converge Pipeline and App classes (#1021)

Co-authored-by: Deven Patel <deven298@yahoo.com>

docs/integration/chainlit.mdx

@@ -21,7 +21,7 @@ Create a new file called `app.py` and add the following code:
 
 ```python
 import chainlit as cl
-from embedchain import Pipeline as App
+from embedchain import App
 
 import os
 

docs/integration/langsmith.mdx

@@ -39,7 +39,7 @@ os.environ['LANGCHAIN_PROJECT] = <your-project>
 
 
 ```python
-from embedchain import Pipeline as App
+from embedchain import App
 
 app = App()
 app.add("https://en.wikipedia.org/wiki/Elon_Musk")

docs/integration/streamlit-mistral.mdx

@@ -17,7 +17,7 @@ pip install embedchain streamlit
     <Tab title="app.py">
     ```python
     import os
-    from embedchain import Pipeline as App
+    from embedchain import App
     import streamlit as st
 
     with st.sidebar: