Add dev script

Procfile.dev

@@ -1 +1,2 @@
 web: NODE_ENV=development node server.js
+db: redis-server --port 6379

README.md

@@ -6,6 +6,4 @@ The project is sponsored by [Cloudflare](https://cloudflare.com) and [Heroku](ht
 
 ## Development
 
-The website was built using [create-react-app](https://github.com/facebookincubator/create-react-app). This is the app you see when you run `yarn start`. However, none of the package links will work.
-
-To start the backend, use `yarn run server`. This will start the backend so the website (which is really just a static HTML file) can serve as a proxy for package requests.
+To start the server, use `yarn dev`. This will start the backend so the website (which is really just a static HTML file) can serve as a proxy for package requests. Then, start the app in another shell with `yarn start`.

package.json

@@ -5,8 +5,8 @@
   "scripts": {
     "start": "node scripts/start.js",
     "build": "node scripts/build.js",
-    "serve": "heroku local -f Procfile.local -p 3001",
-    "test": "node scripts/test.js --env=jsdom"
+    "test": "node scripts/test.js --env=jsdom",
+    "dev": "heroku local -f Procfile.dev -p 3001"
   },
   "dependencies": {
     "algoliasearch": "^3.24.3",