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/template/calendar.html

@@ -31,8 +31,12 @@
         
     </div>
     {% endfor %}
+    <div id=calendars class="container">
+        <a class="button" href="login/google">Google Calendar</a>
+        <a class="button" href="#" >Nextcloud Calendar</a>
+    </div>
     <div class="container">
-        <div class="button addcalendar" style="width: auto; margin: 4rem">Add Calendar</div>
+        <a class="button addcalendar" href="/login/google" style="width: auto; margin: 4rem">Add Calendar</a>
     </div> 
 
 <script type="text/javascript">