update html to include overide option

calendars.json

@@ -1,10 +1,10 @@
 [
     {
-        "url": "https://example.com/calendar1.ics",
-        "prefix": "Calendar 1"
+        "url": "https://calendar.google.com/calendar/ical/b4c66eb4bb2cc15257d071bab3f935385778b042112ea1aaedada47f3f1a6e3a%40group.calendar.google.com/public/basic.ics",
+        "prefix": "work"
     },
     {
-        "url": "https://example.com/calendar2.ics",
+        "url": "https://calendar.google.com/calendar/ical/774518759e4e2dd42aab0c511b02397bb216f3b67dc425d76bae07d1eff529d6%40group.calendar.google.com/public/basic.ics",
         "prefix": "Calendar 2"
     }
 ]

index.html

@@ -32,6 +32,8 @@
         <div id="calendars">
             <div class="calendar">
                 <input type="text" id="prefix-0" placeholder="Prefix">
+                <input type="checkbox" id="override-0">
+                <label for="override-0">Override</label>
                 <input type="url" id="url-0" placeholder="Calendar URL">
             </div>
         </div>
@@ -42,5 +44,4 @@
 
     <script src="script.js"></script>
 </body>
-</html>
-
+</html>