Improve documentation landing page

docs/input/_Navbar.cshtml

@@ -0,0 +1,12 @@
+@{
+    List<Tuple<string, string>> pages = new List<Tuple<string, string>>
+    {
+        Tuple.Create("Documentation", Context.GetLink("docs")),
+        Tuple.Create("API", Context.GetLink("api/Cake.AzureDevOps"))
+    };
+    foreach(Tuple<string, string> p in pages)
+    {
+        string active = Context.GetLink(Document).StartsWith(p.Item2) ? "active" : null;
+        <li class="@active"><a href="@p.Item2">@Html.Raw(p.Item1)</a></li>
+    }
+}

docs/input/assets/css/override.less

@@ -119,4 +119,21 @@ pre:hover .btn-copy {
 	a, a:active, a:hover, a:focus {
 		color: #fff;
 	}
+}
+
+/* For feature list */
+
+.feature-list li {
+    display: block;
+}
+
+.feature-list li:before {
+    /*Using a Bootstrap glyphicon as the bullet point*/
+    content: "\e013";
+    font-family: 'Glyphicons Halflings';
+    font-size: 12px;
+    float: left;
+    margin-top: 1px;
+    margin-left: -25px;
+    color: green;
 }

docs/input/index.cshtml

@@ -1,13 +1,37 @@
 ---
 Title: Cake.AzureDevOps
 NoSidebar: true
-NoContainer: false
+NoContainer: true
 NoGutter: true
 ---
 
-<div class="container">				
-	<h1>What is it?</h1>
+<div class="jumbotron">
+    <div class="container">
+        <h1 class="display-4">Cake.AzureDevOps</h1>
+        <p>
+            Cake addin for working with Azure DevOps.<br/>
+        </p>
+        <a class="btn btn-primary btn-lg" href="/Cake.AzureDevOps/docs/" role="button">Learn more</a>
+        <a class="btn btn-primary btn-lg" href="/Cake.AzureDevOps/api/Cake.AzureDevOps/" role="button">API documentation</a>
+    </div>
+</div>
+
+<div class="container">
+    <p style="height: 35px;">
+        <img alt="GitHub" src="https://img.shields.io/github/license/cake-contrib/Cake.AzureDevOps">
+        <img alt="GitHub release (latest SemVer)" src="https://img.shields.io/github/v/release/cake-contrib/Cake.AzureDevOps">
+        <img alt="Nuget" src="https://img.shields.io/nuget/dt/Cake.AzureDevOps">
+    </p>
+
+    <p>
+        The Azure DevOps Addin for <a href="http://cakebuild.net/" target="_blank">Cake</a> allows you to access Azure DevOps from Cake build scripts.
+    </p>
+
     <p>
-        The Azure DevOps Addin for <a href="http://cakebuild.net/" target="_blank">Cake</a> allows you to access Azure DevOps or Azure DevOps Server from Cake build scripts.
+        <h3>Features</h3>
+        <ul class="feature-list">
+            <li>Access to Azure Pipelines builds</li>
+            <li>Access to Azure Repos pull requests</li>
+        </ul>
     </p>
 </div>