[Feature]: Add posthog anonymous telemetry and update docs (#867)

docs/get-started/faq.mdx

@@ -9,7 +9,7 @@ description: 'Collections of all the frequently asked questions'
 
 ```python main.py
 import os
-from embedchain import App
+from embedchain import Pipeline as App
 
 os.environ['OPENAI_API_KEY'] = 'xxx'
 
@@ -36,7 +36,7 @@ llm:
 
 ```python main.py
 import os
-from embedchain import App
+from embedchain import Pipeline as App
 
 os.environ['OPENAI_API_KEY'] = 'xxx'