Resume work on first draft of docs

docs/getting-started/installation.md

@@ -6,8 +6,9 @@ You will need:
 
  - Node.JS (Latest LTS is recommended)
  - A Package Manager (Yarn or NPM)
+ - Rollup (install with `npm intall -g rollup`)
 
-## Install `npm` Modules
+## Installing `npm` Modules
 
 Run the following the command to install the required packages and TypeScript declaration files:
 
@@ -20,3 +21,5 @@ Or if you're running `yarn`:
 ```bash
 yarn
 ```
+
+Next up, we'll configure our environment and run our first code deploy.