update docs

Author: liumiaowilson

Diff for: doc/script-apex/src/layouts/guide.soy

@@ -14,6 +14,7 @@
 					{param style: 'topbar-light topbar-docs' /}
 					{param logo: [
 						'text': $site.title,
+						'href': '/script-apex',
 						'icon': 'icon-16-hammer'
 					] /}
 				{/call}

Diff for: doc/script-apex/src/layouts/main.soy

@@ -14,6 +14,7 @@
 				{param style: 'topbar-light' /}
 				{param logo: [
 					'text': $site.title,
+					'href': '/script-apex',
 					'icon': 'icon-16-hammer'
 				] /}
 			{/call}

Diff for: doc/script-apex/src/layouts/tutorial.soy

@@ -39,6 +39,7 @@
 			{param style: 'topbar-light' /}
 			{param logo: [
 				'text': $site.title,
+				'href': '/script-apex',
 				'icon': 'icon-16-hammer'
 			] /}
 		{/call}

Diff for: doc/script-apex/src/pages/docs/index.soy

@@ -18,6 +18,7 @@ description: "Everything you need to know to get started."
 					{param style: 'topbar-light topbar-docs' /}
 					{param logo: [
 						'text': $site.title,
+						'href': '/script-apex',
 						'icon': 'icon-16-hammer'
 					] /}
 				{/call}

Diff for: doc/script-apex/src/pages/index.soy

@@ -31,8 +31,10 @@ description: "Script.apex is a library that evaluates Javascript expressions in
 		<div class="container">
 			<h1 class="header-title">{$site.title}</h1>
 			<h2 class="header-subtitle">{$site.index.description}</h2>
-			<div class="header-cta">
-				<a href="/script-apex/tutorials/getting_started/step_1.html" class="btn btn-accent">Get Started</a>
+            <div class="btn-group">
+				<a href="/script-apex/tutorials/getting_started/step_1.html" class="btn btn-accent btn-sm">Get Started</a>
+				<a href="https://github.com/Click-to-Cloud/Script.apex/" class="btn btn-success btn-sm">GitHub</a>
+				<a href="/" onclick="location.assign('/')" class="btn btn-default btn-sm">Not Interested</a>
 			</div>
 		</div>
 	</header>