Move CSS and fonts to separate static asset dir

assets/css/themes/default-light.css

@@ -0,0 +1,34 @@
+body {
+  background-color: #f5f2eb;
+  color: #3b3a38;
+}
+
+h1, h2, h3, h4 {
+  color: #191818;
+}
+
+a {
+  color: #023b77;
+}
+
+a:visited {
+  color: #3b0277;
+}
+
+code {
+  background-color: #e8e3da;
+  color: #027739;
+}
+
+pre code {
+  background-color: #333;
+  color: #ccc;
+}
+
+p.meta .date {
+  color: #888;
+}
+
+p.meta .name a {
+  color: #3b3a38;
+}