add makefile

Author: tstromberg

Makefile

@@ -0,0 +1,6 @@
+.PHONY: run
+
+run:
+	@command -v npx >/dev/null 2>&1 || { echo "npx not found. Please install Node.js and npm."; exit 1; }
+	@npx eleventy --version >/dev/null 2>&1 || { echo "Eleventy not found. Installing dependencies..."; npm install; }
+	npm run dev