Comprehensive README overhaul: features, better docs, removed icecast

Major improvements to documentation:

**Features Section (NEW):**
- Comprehensive features list at the top of README
- Organized into: Core Streaming, AI Features, Data & Analytics, Developer Experience
- Clear descriptions of all capabilities (transcription, summarization, weekly summaries, smart suggestions, etc.)

**Quick Start (IMPROVED):**
- Step-by-step guide for developers (7 clear steps)
- Minimum vs full configuration examples
- Detailed explanation of important settings
- Better organized with Prerequisites section

**Getting API Keys (IMPROVED):**
- Step-by-step instructions for OpenAI, Gemini, Trilium, ElevenLabs
- Cost information included with each provider
- Free tier details for Gemini

**Configuration Reference (NEW):**
- Comprehensive tables of all environment variables
- Organized by category (Core, Audio, Transcription, Trilium, etc.)
- Clear defaults and descriptions

**API Endpoints (IMPROVED):**
- Better organized by category
- More examples with curl commands
- Response format examples

**Cost Estimates (IMPROVED):**
- Added Light/Moderate/Heavy usage examples
- Clearer monthly cost breakdowns
- Better explanation of Gemini free tier

**Running as a Service (IMPROVED):**
- Better step-by-step systemd setup
- Updating section with ./update.sh details

**Development (IMPROVED):**
- Setting up dev environment
- Running tests with examples
- Code quality tools
- Project structure diagram
- Database migrations
- CI/CD overview

**Architecture (NEW):**
- Streaming pipeline explanation
- Multi-client streaming details
- Transcription pipeline flow
- Background processing model

**Troubleshooting (NEW):**
- Common issues with solutions
- Port conflicts, missing dependencies, database locks, Trilium connection

**Removed icecast:**
- Removed all references to icecast2 from README, CLAUDE.md, and setup.sh
- Application doesn't use icecast, only ffmpeg for streaming

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: MrDesjardins

CLAUDE.md

@@ -205,12 +205,11 @@ FASTAPI_HOST=10.0.0.181 FASTAPI_API_PORT=8000 uv run main.py
 Required system packages:
 - `yt-dlp` - YouTube audio extraction
 - `ffmpeg` - Audio conversion and streaming
-- `icecast2` - Optional for streaming infrastructure
 
 Install with:
 ```sh
 sudo apt update
-sudo apt install -y yt-dlp ffmpeg icecast2
+sudo apt install -y yt-dlp ffmpeg
 ```
 
 Note: The application expects `yt-dlp` to be at `/usr/local/bin/yt-dlp` (see main.py:30).
@@ -611,7 +610,7 @@ Run the setup script to install dependencies and initialize the database:
 ```
 
 This script will:
-1. Install system dependencies (yt-dlp, ffmpeg, icecast2)
+1. Install system dependencies (yt-dlp, ffmpeg)
 2. Install uv (Python package manager) if not present
 3. Install Python dependencies via `uv sync`
 4. Initialize the SQLite database with proper schema