Add github pages publishing script

README.md

@@ -1,5 +1,7 @@
 # Psammead - News React Component Library
 
+[![Storybook](https://github.com/storybooks/press/blob/master/badges/storybook.svg)](http://bbc-news.github.io/psammead)
+
 # Getting Started
 
 ### Clone this repositry
@@ -16,12 +18,23 @@ cd psammead && npm install
 
 NB, this automatically runs `npm run install:packages` in a postinstall step for you.
 
-### Run Storybook
+## Storybook
 
+### Run Locally
 ```
 npm run storybook
 ```
 
+### Deploying
+
+The Psammead Storybook is hosted on GitHub pages at http://bbc-news.github.io/psammead. It is currently deployed via a local script that builds Storybook to the `gh-pages` git branch which is used by GitHub pages.
+
+```
+rpm run deploy-storybook
+```
+
+NB, this automatically pushes to the 'gh-pages' branch, which deploys to the live GitHub pages site. Please only run this script on the `latest` branch.
+
 ### Build Packages/Components
 
 ```