Updated build and publish setup for unpkg deployment

refs https://github.com/TryGhost/members.js/issues/12

- Updates package name and add umd/unpkg setup in `package.json`
- Updated webpack config to publish minified bundle at `umd/memebrs.min.js`
- Updated .gitignore to remove build folders

ghost/portal/.gitignore

@@ -68,8 +68,9 @@ typings/
 # OSX
 .DS_Store
 
-# Membersjs Custom
-build
+# Membersjs build folders
+umd/
+build/
 
 ## config
 .env.local

ghost/portal/package.json

@@ -1,9 +1,15 @@
 {
-  "name": "membersjs",
+  "name": "@tryghost/members-js",
   "version": "0.1.0",
   "license": "MIT",
   "repository": "git@github.com:TryGhost/membersjs.git",
   "author": "Ghost Foundation",
+  "unpkg": "umd/members.min.js",
+  "files": [
+    "umd/",
+    "LICENSE",
+    "README.md"
+  ],
   "dependencies": {
     "@testing-library/jest-dom": "^4.2.4",
     "@testing-library/react": "^9.3.2",
@@ -21,7 +27,8 @@
     "test": "react-scripts test",
     "eject": "react-scripts eject",
     "lint": "eslint src --ext .js --cache",
-    "posttest": "yarn lint"
+    "posttest": "yarn lint",
+    "prepublishOnly": "yarn build"
   },
   "eslintConfig": {
     "extends": ["react-app", "plugin:ghost/browser"],

ghost/portal/webpack.config.js

@@ -6,7 +6,8 @@ module.exports = {
         'bundle.js': glob.sync('build/static/?(js|css)/main.*.?(js|css)').map(f => path.resolve(__dirname, f))
     },
     output: {
-        filename: 'build/static/js/bundle.min.js'
+        filename: 'members.min.js',
+        path: __dirname + '/umd'
     },
     module: {
         rules: [