Modify CSS, image & related so img of heart works.

Putting the heart on the floated right corner should work pretty well
now with this CSS.

www/conservancy/static/forms.css

@@ -56,4 +56,12 @@ img.appeal {
 img.appeal-header {
     max-width: 100%;
     height: auto;
+}
+
+img.appeal-footer {
+    max-width: 40%;
+    float: right;
+    width: 10%;
+    min-width: 1%;
+    height: auto;
 }

www/conservancy/static/supporter/index.html

@@ -112,6 +112,8 @@ of dollars in licensing fees for subpar accounting software.</li>
     discusses important legal and policy issues in open source and free
     software.</li></ul>
 
+<img class="appeal-footer" alt="Become a Conservancy Supporter!" src="/img/conservancy-supporter-heart.png"/>
+
 <p>As an organization, we try to do do everything transparently; even 
 our
 <a