Enable RTL layout by providing 'rtl = true' in the config (#72)

assets/scss/_base_rtl.scss

@@ -0,0 +1,23 @@
+body.rtl {
+  direction: rtl;
+
+  pre {
+    direction: ltr;
+  }
+
+  blockquote {
+    border-left: none;
+    border-right: 2px solid $alt-bg-color;
+    padding-left: 0;
+    padding-right: 1.6rem;
+  }
+
+  table tr td:first-child,
+  table tr th:first-child {
+    border-right: 0;
+  }
+  table tr td:last-child,
+  table tr th:last-child {
+    border-left: 0;
+  }
+}