Update Python Quick Start Guides

### SDK Python SDK ### Description Update the Python quick start guides to be in line with our new quick start guide format (see Javascript SDKs). We've agreed on updating the following guides first: - [ ] Python vanilla - [ ] Django - [ ] FastAPI - [ ] Starlette - [ ] Celery - [ ] SQLAlchemy - [ ] Boto3 - [ ] HTTPX - [ ] Redis - [ ] Flask - [ ] OpenAI ### Suggested Solution _No response_