feat(docs): Add Deploying to Now doc (#8729)

docs/docs/deploying-to-now.md

@@ -0,0 +1,25 @@
+---
+title: Deploying to Now
+---
+
+In order to deploy your Gatsby project using [Now](https://zeit.co/now), you can do the following:
+
+1.  Install the Now CLI
+
+`npm install -g now`
+
+2.  Install a node server package (such as `serve`, or `http-server`)
+
+`npm install --save serve`
+
+3.  Add a `start` script to your `package.json` file, this is what Now will use to run your application:
+
+```json:title=package.json
+{
+  "scripts": {
+    "start": "serve public/"
+  }
+}
+```
+
+4.  Run `now` at the root of your Gatsby project, this will upload your project, run the `build` script, and then your `start` script.