Create card components and add them to dashboard

Refactor the Releases, Modules and Projects cards into reusable
templates. Now they are used in the non-logged-in landing homepage
and in the logged-in dashboard.

templates/blender_components/card_projects.tmpl

@@ -0,0 +1,20 @@
+<div class="ui card">
+    <div class="content">
+        <span class="header">Ongoing Projects</span>
+        <div class="meta">
+            <span class="date">Focused activities to advance Blender</span>
+        </div>
+        <div class="description">
+            <ul>
+                <li>Animation 25 — Next generation animation system</li>
+                <li>Simulation Nodes — Everything with nodes</li>
+                <li>Brush Assets — The asset system and browser</li>
+            </ul>
+        </div>
+    </div>
+    <div class="extra content">
+              <span class="right floated">
+                <a>View all projects...</a>
+              </span>
+    </div>
+</div>