Prevent double clicking of the submit button on login (#3554)

Signed-off-by: Philip Corliss <pcorliss@drwholdings.com>

web/static/main.css

@@ -32,6 +32,11 @@ body {
   outline: none;
 }
 
+.dex-btn:disabled {
+  cursor: not-allowed;
+  opacity: 0.5;
+}
+
 .dex-btn-icon {
   background-position: center;
   background-repeat: no-repeat;

web/templates/password.html

@@ -32,4 +32,12 @@
   {{ end }}
 </div>
 
+
+<script type="text/javascript">
+  document.querySelector('form').onsubmit = function(e) {
+    var el = document.querySelector('#submit-login');
+    el.setAttribute('disabled', 'disabled');
+  };
+</script>
+
 {{ template "footer.html" . }}