Remove donation button in refresh modal

Author: jackycute

public/views/refresh-modal.ejs

@@ -24,7 +24,6 @@
                 </div>
             </div>
             <div class="modal-footer">
-                <a class="btn btn-danger" href="https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=KDGS4PREHX6QQ&lc=US&item_name=HackMD&amount=5%2e00&currency_code=USD&bn=PP%2dDonationsBF%3abtn_donate_LG%2egif%3aNonHosted" target="_blank"><i class="fa fa-coffee"></i> Buy us coffee</a>
                 <button type="button" class="btn btn-primary" id="refreshModalRefresh">Refresh</button>
             </div>
         </div>