Remove special link class

This cleans up the code quite a bit, but also allows links in editable
content to be rendered with the default style.

app/views/admin/invitations/index.html.erb

@@ -44,8 +44,8 @@
             <tr>
               <td class="overflow-ellipsis font-mono"><%= invitation.token %></td>
               <td><%= invitation.used_at.strftime("%Y-%m-%d (%H:%M UTC)") %></td>
-              <td><%= link_to invitation.user.cn, admin_user_path(invitation.user.cn), class: "ks-text-link" %></td>
-              <td><%= link_to invitation.invitee.cn, admin_user_path(invitation.invitee.cn), class: "ks-text-link" %></td>
+              <td><%= link_to invitation.user.cn, admin_user_path(invitation.user.cn) %></td>
+              <td><%= link_to invitation.invitee.cn, admin_user_path(invitation.invitee.cn) %></td>
             </tr>
           <% end %>
         </tbody>