More Storybot updates (#1116)

* initial changes for gemini storybot

* storybot updates for gemini

* more storybot updates

* interim interruptible commit

* cleanup

* cleanup

* cleanup

* first draft

* wip

* more storybot fixes

* more storybot updates WIP

* committing before changing the image prompting strategy

* wip

* prompt updating

* cleanup

* cleanup

* cleanup

* readme cleanup

* fixup

examples/storytelling-chatbot/src/bot_runner.py

@@ -217,7 +217,6 @@ if __name__ == "__main__":
     required_env_vars = [
         "GOOGLE_API_KEY",
         "DAILY_API_KEY",
-        "FAL_KEY",
         "ELEVENLABS_VOICE_ID",
         "ELEVENLABS_API_KEY",
     ]