Use Makefile for building.

Makefile

@@ -0,0 +1,29 @@
+NODE_EXE := $(shell which node)
+NPM_EXE := $(shell which npm)
+
+BUILD_EXE := build.js
+
+all: install build
+
+install:
+	${NPM_EXE} ci
+
+update:
+	${NPM_EXE} update --save
+
+build:
+	${NODE_EXE} ${BUILD_EXE}
+
+rebuild-css:
+	${NODE_EXE} ${BUILD_EXE} css
+
+rebuild-html:
+	${NODE_EXE} ${BUILD_EXE} html
+
+rebuild-js:
+	${NODE_EXE} ${BUILD_EXE} js
+
+rebuild-webmanifest:
+	${NODE_EXE} ${BUILD_EXE} webmanifest
+
+.PHONY: all install update build rebuild-css rebuild-html rebuild-js rebuild-webmanifest