docs(README): update installation instructions

- Add instructions for installing pre-built binary
  * Separate steps for macOS (M1/M2 and Intel), Linux, and Windows
  * Move binary to PATH and make executable
- Add instructions for installing from source
  * Install Deno
  * Clone repo and install with Deno task
- Remove outdated development instructions

Author: sidedwards

README.md

@@ -11,18 +11,40 @@ Automatically generate git commit messages using AI. Analyzes your staged change
 
 ## Installation
 
+### Option 1: Pre-built Binary
+
 1. Download the latest release for your platform from [GitHub Releases](https://github.com/sidedwards/auto-commit/releases)
 2. Move to a location in your PATH:
 
 ```bash
-# macOS/Linux
-sudo mv auto-commit-* /usr/local/bin/auto-commit
+# macOS (M1/M2)
+sudo mv auto-commit-darwin-arm64 /usr/local/bin/auto-commit
+
+# macOS (Intel)
+sudo mv auto-commit-darwin-x64 /usr/local/bin/auto-commit
+
+# Linux
+sudo mv auto-commit-linux-x64 /usr/local/bin/auto-commit
+
+# Make executable (macOS/Linux)
 sudo chmod +x /usr/local/bin/auto-commit
 
 # Windows (PowerShell as Admin)
-move auto-commit-*.exe C:\Windows\System32\auto-commit.exe
+move auto-commit-windows-x64.exe C:\Windows\System32\auto-commit.exe
 ```
 
+### Option 2: Install from Source
+
+````bash
+# Install Deno
+curl -fsSL https://deno.land/x/install/install.sh | sh
+
+# Clone and install
+git clone https://github.com/sidedwards/auto-commit.git
+cd auto-commit
+deno task install
+````
+
 ## Usage
 
 ```bash
@@ -51,21 +73,6 @@ Proposed commit:
 
 On first run, you'll be prompted to enter your [Anthropic API key](https://console.anthropic.com/account/keys).
 
-## Development
-
-```bash
-# Install dependencies
-git clone https://github.com/sidedwards/auto-commit.git
-cd auto-commit
-
-# Build
-deno task build
-
-# Create release
-git tag -a v1.0.0 -m "Release v1.0.0"
-git push origin v1.0.0
-```
-
 ## Requirements
 
 - Git