docs(aio): rename cb- files and a few others

aio/content/guide/docs.md

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+@title
+Angular Docs
+
+@description
+
+<div class="card-container clearfix">
+
+    <a href="./guide/quickstart" class="card">
+        <h2>Quickstart</h2>
+        <p>A quick look at an Angular application.</p>
+        <p class="card-footer">View Quickstart</p>
+    </a>
+
+    <a href="guide/learning-angular" class="card">
+        <h2>Getting Started</h2>
+        <p>A beginner's guide to basic Angular concepts.</p>
+        <p class="card-footer">View Getting Started</p>
+    </a>
+
+    <a href="tutorial" class="card">
+        <h2>Tutorial</h2>
+        <p>The "Tour of Heroes" tutorial, a step-by-step.</p>
+        <p class="card-footer">View Tutorial</p>
+    </a>
+
+    <a href="api" class="card">
+        <h2>API Reference</h2>
+        <p>The developer's reference to Angular classes, methods, etc.</p>
+        <p class="card-footer">View API Reference</p>
+    </a>
+
+    <a href="guide/core" class="card">
+        <h2>Core Guide</h2>
+        <p>Core features of Angular.</p>
+        <p class="card-footer">View Core Guide</p>
+    </a>
+
+    <a href="guide/additional" class="card">
+        <h2>Additional Techniques</h2>
+        <p>Additional modules and techniques.</p>
+        <p class="card-footer">View Additional Techniques</p>
+    </a>
+
+<div>
+
+This is the Angular **version 4** documentation. See what's new in the [documentation changelog](guide/change-log). View the [Angular change log](https://github.com/angular/angular/blob/master/CHANGELOG.md) for enhancement and fixes to Angular itself.
+
+The Angular **version 2** documentation has been archived at [v2.angular.io](https://v2.angular.io "Angular v2 Docs").