docs: update README for PyPI installation

- Primary install is now `pip install thinkbooster`
- setup.sh moved to optional section for advanced scorers
- Added PyPI badge
- Updated Python version badge to 3.10+
- Removed lm-polygraph submodule from project structure

Author: smirnovlad

README.md

@@ -4,7 +4,8 @@
 </div>
 
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
-[![Python 3.11](https://img.shields.io/badge/python-3.11-blue.svg)](https://www.python.org/downloads/release/python-3110/)
+[![Python 3.10+](https://img.shields.io/badge/python-3.10+-blue.svg)](https://www.python.org/downloads/)
+[![PyPI](https://img.shields.io/pypi/v/thinkbooster)](https://pypi.org/project/thinkbooster/)
 [![arXiv](https://img.shields.io/badge/arXiv-b31b1b.svg)](https://thinkbooster.s3.us-east-1.amazonaws.com/thinkbooster.pdf)
 
 [Quick Start](#quick-start) | [Key Features](#key-features) | [Strategies](#supported-strategies) | [Visual Debugger](#visual-debugger) | [Documentation](#documentation)
@@ -28,20 +29,33 @@ ThinkBooster is an open-source framework for **test-time compute scaling** of la
 ### Installation
 
 ```bash
-# Clone the repository
+pip install thinkbooster
+```
+
+Or install from source for development:
+
+```bash
 git clone https://github.com/IINemo/thinkbooster.git
 cd thinkbooster
+pip install -e ".[dev]"
+```
+
+<details>
+<summary>Optional: additional scorers (UHead, KernelAct)</summary>
 
-# Create conda environment
-conda create -n thinkbooster python=3.11 -y
-conda activate thinkbooster
+Some advanced scorers require GitHub-only dependencies. Run `setup.sh` after pip install:
 
-# Install dependencies
+```bash
 ./setup.sh
+```
+
+This installs `llm-uncertainty-head`, `vllm-speculators`, and `KernelAct`. Core functionality (all strategies, PRM/entropy/probability scorers, evaluation) works without these.
 
-# Configure API keys
+</details>
+
+```bash
+# Configure API keys (optional, for LLM judge and OpenRouter)
 cp .env.example .env
-# Edit .env and add your OPENROUTER_API_KEY
 ```
 
 ### REST API
@@ -151,7 +165,7 @@ thinkbooster/
 ├── service_app/          # REST API service + visual debugger
 ├── tests/                # Test suite with strategy registry
 ├── docs/                 # Documentation
-└── lm-polygraph/         # Submodule: uncertainty estimation
+└── setup.sh              # Optional: install GitHub-only deps (UHead, KernelAct)
 ```
 
 See [Project Structure](docs/getting_started/project_structure.md) for a detailed architecture overview.