cleanup examples and remove requests library

examples/foundational/15a-switch-languages.py

@@ -55,7 +55,9 @@ async def spanish_filter(frame) -> bool:
     return current_language == "Spanish"
 
 
-async def main(room_url: str, token):
+async def main():
+    (room_url, token) = await configure()
+
     async with aiohttp.ClientSession() as session:
         transport = DailyTransport(
             room_url,
@@ -149,5 +151,4 @@ async def main(room_url: str, token):
 
 
 if __name__ == "__main__":
-    (url, token) = configure()
-    asyncio.run(main(url, token))
+    asyncio.run(main())