fix: Use e2b base SDK instead of e2b-code-interpreter

Author: beran-t

docs/examples/app-preview.mdx

@@ -22,7 +22,7 @@ The orchestrator script on your machine creates the sandbox, deploys the app, an
 - Python 3.10+
 
 ```bash
-pip install e2b-code-interpreter
+pip install e2b
 ```
 
 Set both keys in your environment:
@@ -39,7 +39,7 @@ KERNEL_API_KEY=kernel_***
 Start an E2B sandbox using the `kernel-browser` template, which comes with the Kernel SDK and Playwright client pre-installed. No local browser binary is needed — Kernel provides the browser remotely.
 
 ```python
-from e2b_code_interpreter import Sandbox
+from e2b import Sandbox
 
 sandbox = Sandbox.create(
     "kernel-browser",
@@ -125,7 +125,7 @@ import os
 import time
 import json
 
-from e2b_code_interpreter import Sandbox
+from e2b import Sandbox
 
 # A sample FastAPI app to deploy inside the sandbox
 FASTAPI_APP = '''