Update README.md

[skull8888888]

[!IMPORTANT] Updated README.md with enhanced feature descriptions, setup instructions, and Python quickstart guide for Laminar platform.

• Overview:
  • Updated introduction to describe Laminar as an all-in-one open-source platform for AI product engineering.
  • Added detailed feature list with checkboxes for tracing, evaluations, labels, datasets, scalability, and stack components.
• Getting Started:
  • Revised instructions for self-hosting with Docker Compose, emphasizing the managed platform and production setup.
  • Detailed the components spun up by docker-compose-full.yml.
• Python Quickstart:
  • Updated Python quickstart guide with clearer instructions for setting up and using the lmnr package.
  • Simplified example code for tracing LLM calls and function inputs/outputs.
• Visuals and Links:
  • Added new images and updated badges for Y Combinator, Twitter, and Discord.
  • Updated links to documentation and client libraries.

^{This description was created by for 851edf985889d0664ffa4c503fc2a11713a9b374. It will automatically update as commits are pushed.}