Add support of allow anonymous config option with correspond modifications

public/views/index.ejs

@@ -62,13 +62,17 @@
                             <br>
                             <a type="button" class="btn btn-lg btn-success ui-signin" data-toggle="modal" data-target=".signin-modal" style="min-width: 170px;"><%= __('Sign In') %></a>
                         </span>
+                        <% }%>
+                        <% if((facebook || twitter || github || gitlab || dropbox || google || email) && allowAnonmyous) { %>
                         <span class="ui-or"><%= __('or') %></span>
                         <% }%>
+                        <% if(allowAnonmyous) { %>
                         <span class="ui-signin">
                             <a href="<%- url %>/new" class="btn btn-lg btn-default" style="min-width: 170px;"><%= __('New guest note') %></a>
                             <br>
                             <br>
                         </span>
+                        <% }%>
                         <div class="lead row" style="width: 90%; margin: 0 auto;">
                             <div class="col-md-4 inner">
                                 <a href="<%- url %>/features#share-notes">