Add free-ports script, Docker aliases, and Bun env

Add free-ports.sh script and a corresponding alias in .bash_aliases.
Introduce docker-clean and docker-update aliases for Docker maintenance.

Export BUN_INSTALL and prepend its bin directory to PATH in .profile.

.profile

@@ -39,4 +39,8 @@ if [ -n "$BASH_VERSION" ] && [ -f "$HOME/.bashrc" ]; then
     . "$HOME/.bashrc"
 fi
 
+# bun
+export BUN_INSTALL="$HOME/.bun"
+export PATH="$BUN_INSTALL/bin:$PATH"
+
 export PATH