feat: install script re-org

install.d/70-cca.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+# -----------------------------------------------------------------------------
+# Description:
+#   (macOS only) Install Colour Contrast Analyser (CCA).
+#
+
+# macOS only
+[[ "$DOTS_OS" != "macos" ]] && { log_skip "Not macOS"; return 0; }
+
+if ! echo "$BREW_CASKS" | grep -q "^colour-contrast-analyser$"; then
+    brew install --cask colour-contrast-analyser
+else
+    echo "Colour Contrast Analyser (CCA) is already installed."
+fi
+log_pass "CCA installed"