routing updated to be more variable and on demand

- calendar json file now generated on demand at download request
- device fingerprint route now added

server/static/css/main.css

@@ -227,6 +227,10 @@ body *
     color: #333;
 }
 
+.grey {
+    background-color: #ddd;
+}
+
 .sub.container .name {
     margin-right: 1rem;
 }