[Refactor] Remove usage of 'Pipeline' in favor of 'App' (#1246)

embedchain/deployment/render.com/app.py

@@ -1,10 +1,10 @@
 from fastapi import FastAPI, responses
 from pydantic import BaseModel
 
-from embedchain import Pipeline
+from embedchain import App
 
 app = FastAPI(title="Embedchain FastAPI App")
-embedchain_app = Pipeline()
+embedchain_app = App()
 
 
 class SourceModel(BaseModel):