Update starting page to make it easier to get up and running

Author: stwrt

Sources/WebKit/WebKit.docc/WebKit.md

@@ -2,7 +2,29 @@
 
 WebKit is a cross-platform web browser engine. On iOS and macOS, it powers Safari, Mail, iBooks, and many other applications.
 
-## Overview
+## Downloading the Source Code
+
+```
+git clone https://github.com/WebKit/WebKit.git WebKit
+```
+
+## Building WebKit
+
+```
+cd WebKit
+Tools/Scripts/build-webkit
+```
+
+## Running Minibrowser
+
+```
+Tools/Scripts/run-minibrowser
+```
+
+## Contribute
+
+Congratulations! You’re up and running. Now you can begin coding in WebKit and contribute your fixes and new features to the project. 
+For details on submitting your code to the project, read [Contributing Code](https://webkit.org/contributing-code/).
 
 ## Feature Status
 
@@ -23,19 +45,6 @@ On Windows, you will have to build it yourself.
 Once your bug is filed, you will receive email when it is updated at each stage in the [bug life cycle](https://webkit.org/bug-life-cycle). 
 After the bug is considered fixed, you may be asked to download the [latest nightly](https://webkit.org/nightly) and confirm that the fix works for you.
 
-## Downloading the Code
-
-Run the following command to clone WebKit's Git repository:
-
-```
-git clone https://github.com/WebKit/WebKit.git WebKit
-```
-
-## Contribute
-
-Congratulations! You’re up and running. Now you can begin coding in WebKit and contribute your fixes and new features to the project. 
-For details on submitting your code to the project, read [Contributing Code](https://webkit.org/contributing-code/).
-
 
 ## Topics