Revise README to be similar to API app

This restructures the sections based on what we agreed for the API
repo.

README.md

@@ -2,8 +2,6 @@
 
 GOV.UK Notify admin application - https://www.notifications.service.gov.uk/
 
-## Features of this application
-
  - Register and manage users
  - Create and manage services
  - Send batch emails and SMS by uploading a CSV
@@ -11,37 +9,24 @@ GOV.UK Notify admin application - https://www.notifications.service.gov.uk/
 
 ## Setting up
 
-### Make sure you're using correct language versions
+### Python version
 
-Languages needed
-- Python 3.6.x
+At the moment we run Python 3.6 in production.
 
-Need to install node? Run:
+### NPM packages
 
 ```shell
 brew install node
 ```
 
-#### `n` For Node version management
-
-[NPM](npmjs.org) is Node's package management tool. `n` is a tool for managing
-different versions of Node. The following installs `n` and uses the long term support (LTS)
-version of Node.
+[NPM](npmjs.org) is Node's package management tool. `n` is a tool for managing different versions of Node. The following installs `n` and uses the long term support (LTS) version of Node.
 
 ```shell
 npm install -g n
 n lts
 ```
 
-### Install Python dependencies
-
-Install dependencies and build the frontend assets:
-
-```shell
-make bootstrap
-```
-
-### Create a local `environment.sh` file
+### `environment.sh`
 
 In the root directory of the application, run:
 
@@ -58,15 +43,26 @@ export WERKZEUG_DEBUG_PIN=off
 
 To run parts of the app, such as uploading letters, you will need appropriate AWS credentials. See the [Wiki](https://github.com/alphagov/notifications-manuals/wiki/aws-accounts#how-to-set-up-local-development) for more details.
 
-### Running the application
-
-In the root directory of the application, run:
+## To run the application
 
 ```shell
+# install dependencies, etc.
+make bootstrap
+
+# run the web app
 make run-flask
 ```
 
-Then visit [localhost:6012](http://localhost:6012)
+Then visit [localhost:6012](http://localhost:6012).
+
+## To test the application
+
+```
+# install dependencies, etc.
+make bootstrap
+
+make test
+```
 
 ## Updating application dependencies