update authentication system to Devise

app/views/mailer/password_reset.html.erb

@@ -6,11 +6,11 @@
   <body>
     <p>
       <%= t(:password_reset_message1) %>
-      <br />
+      <br>
       <%= t(:password_reset_message2) %>
-      <br />
+      <br>
       <%= t(:password_reset_message3) %>
-      <br /><br />
+      <br><br>
       <a href="<%= @webpage %>"><%= @webpage %></a>
     </p>
   </body>