feat: install betterdisplay

script/install.d/73-betterdisplay.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+# -----------------------------------------------------------------------------
+# Description:
+#   (macOS only) Install BetterDisplay.
+#
+
+if [[ "$OSTYPE" == "darwin"* ]]; then
+    if ! brew list --cask betterdisplay &> /dev/null; then
+        brew install --cask betterdisplay
+    else
+        echo "BetterDisplay is already installed."
+    fi
+fi