chore(doc): update README.md

Author: trknhr

README.md

@@ -16,11 +16,6 @@ A Go-based CLI tool that provides a one-command workflow to isolate AI-generated
 
 ## Install
 
-```bash
-brew tap trknhr/homebrew-tap
-brew install ai-docs
-```
-
 ```bash
 curl -sSL https://github.com/trknhr/ai-docs/main/install.sh | sh
 ```