Add heml

package.json

@@ -15,6 +15,7 @@
     "eslint-plugin-standard": "^3.0.1",
     "glob": "^7.1.2",
     "gray-matter": "^3.1.1",
+    "heml": "^1.1.3",
     "js-yaml": "^3.10.0",
     "postcss": "^6.0.14",
     "postcss-cli": "^4.1.1",
@@ -43,8 +44,10 @@
   },
   "scripts": {
     "start": "npm run watch:content & react-scripts start",
+    "start:heml": "heml develop email.heml",
     "build": "npm run prepare-content && react-scripts build && npm run build:postcss && react-snapshot && npm run sw",
     "build:postcss": "postcss build/static/css/*.css -r",
+    "build:heml": "postcss build/static/css/*.css -r",
     "parse-content": "node ./functions/parse-content.js",
     "resize-images": "node ./functions/resize-images.js",
     "prepare-content": "npm run parse-content && npm run resize-images",