Added some documentation

docs/_static/custom.css

@@ -0,0 +1,14 @@
+/* override table width restrictions */
+@media screen and (min-width: 767px) {
+
+  .wy-table-responsive table td {
+    /* !important prevents the common CSS stylesheets from
+       overriding this as on RTD they are loaded after this stylesheet */
+    white-space: normal !important;
+  }
+
+  .wy-table-responsive {
+    overflow: visible !important;
+  }
+
+}