adds device page and form for new device

- form added to push new device id to backend
- device added to db model (needs to be pushed still)
- form return right now just prints
- design for device list created, still needs some updates

server/static/css/main.css

@@ -179,6 +179,15 @@ body *
     background-color: #b51409;
 }
 
+.container .button.adddevice {
+    background-color: #ddd;
+    color: white;
+}
+.container .button.addcalendar {
+    background-color: #ddd;
+    color: white;
+}
+
 .sub.container {
     width: 20rem;
     justify-content: left;