remove Homebrew formula and workflow

Author: GokhanKabar

.github/workflows/homebrew.yml

@@ -75,12 +75,6 @@ Measured on a real session — 5 questions about a Rust codebase using `server-f
 curl -fsSL https://raw.githubusercontent.com/rustkit-ai/mcpkill/main/install.sh | sh
 ```
 
-**Homebrew:**
-
-```bash
-brew tap rustkit-ai/tap && brew install mcpkill
-```
-
 **Cargo:**
 
 ```bash