Use ~/.local/bin for local install in README (no sudo required)

Author: tars90percent

README.md

@@ -46,7 +46,8 @@ bun run dev -- --help
 
 # Or build a standalone binary and install it
 bun run build:local
-cp dist/minimax /usr/local/bin/minimax
+mkdir -p ~/.local/bin
+cp dist/minimax ~/.local/bin/minimax
 minimax --help
 ```