use my old "square" logo as favicon

also provide a backgroundless version as a possible splash page image

incorporealcms/static/css/style.css

@@ -104,3 +104,11 @@ blockquote {
     background-color: rgba(120, 120, 120, 0.3);
     padding: 1px 10px;
 }
+
+.splash {
+    text-align: center;
+}
+
+.img-50 {
+    max-width: 50%;
+}