feat(aio): add about component and data

aio/content/marketing/about.html

@@ -0,0 +1,14 @@
+<div class="grid-fluid l-space-bottom-8">
+  <h3 class="title center">Building For the Future</h3>
+  <p>
+    Angular is built by a team of engineers who share a passion for
+    making web development feel effortless. We believe that writing
+    beautiful apps should be joyful and fun. We're building a
+    platform for the future.
+  </p>
+</div>
+
+<div class="grid-fluid l-space-bottom-6">
+  <h3 class="title center">Current Contributors</h3>
+  <aio-contributor-list></aio-contributor-list>
+</div>