build(frontend): fix Makefile

frontend/Makefile

@@ -9,9 +9,10 @@ node_modules: package.json package-lock.json
 	npm install --cache .npm --prefer-offline
 package-lock.json: package.json
 	npm install --cache .npm --prefer-offline
+.PHONY: static
 static: node_modules assets esbuild.config.mjs jsconfig.json postcss.config.js
-	echo "$${PROJECT_DIR}"
 	npm run build
+.PHONY: well-known
 well-known: static ;
 
 assets: assets/favicons assets/icons;