docs: add documentation for logfire integration

docs/my-website/docs/observability/logfire_integration.md

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+import Image from '@theme/IdealImage';
+
+# Logfire - Logging LLM Input/Output
+
+Logfire is open Source Observability & Analytics for LLM Apps
+Detailed production traces and a granular view on quality, cost and latency
+
+<Image img={require('../../img/logfire.png')} />
+
+:::info
+We want to learn how we can make the callbacks better! Meet the LiteLLM [founders](https://calendly.com/d/4mp-gd3-k5k/berriai-1-1-onboarding-litellm-hosted-version) or
+join our [discord](https://discord.gg/wuPM9dRgDw)
+:::
+
+## Pre-Requisites
+
+Ensure you have run `pip install logfire` for this integration
+
+```shell
+pip install logfire litellm
+```
+
+## Quick Start
+
+Get your Logfire token from [Logfire](https://logfire.pydantic.dev/)
+
+```python
+litellm.success_callback = ["logfire"]
+litellm.failure_callback = ["logfire"] # logs errors to logfire
+```
+
+```python
+# pip install logfire
+import litellm
+import os
+
+# from https://logfire.pydantic.dev/
+os.environ["LOGFIRE_TOKEN"] = ""
+
+# LLM API Keys
+os.environ['OPENAI_API_KEY']=""
+
+# set logfire as a callback, litellm will send the data to logfire
+litellm.success_callback = ["logfire"]
+
+# openai call
+response = litellm.completion(
+  model="gpt-3.5-turbo",
+  messages=[
+    {"role": "user", "content": "Hi 👋 - i'm openai"}
+  ]
+)
+```
+
+## Support & Talk to Founders
+
+- [Schedule Demo 👋](https://calendly.com/d/4mp-gd3-k5k/berriai-1-1-onboarding-litellm-hosted-version)
+- [Community Discord 💭](https://discord.gg/wuPM9dRgDw)
+- Our numbers 📞 +1 (770) 8783-106 / ‭+1 (412) 618-6238‬
+- Our emails ✉️ ishaan@berri.ai / krrish@berri.ai