[gbrainy] Remove On extending menu option

[Jordi Mas <jmas src gnome org>]

commit 7773ec3bafb5dd20712fed4c41ba24abacc3f77f
Author: Jordi Mas <jmas softcatala org>
Date:   Fri Jan 1 10:52:36 2021 +0100

    Remove On extending menu option

 src/Clients/Classical/gbrainy.cs | 5 -----
 src/Clients/Classical/gbrainy.ui | 9 ---------
 2 files changed, 14 deletions(-)
---
diff --git a/src/Clients/Classical/gbrainy.cs b/src/Clients/Classical/gbrainy.cs
index a0f23320..cafa28ab 100644
--- a/src/Clients/Classical/gbrainy.cs
+++ b/src/Clients/Classical/gbrainy.cs
@@ -694,11 +694,6 @@ namespace gbrainy.Clients.Classical
                        full_screen = !full_screen;
                }
 
-               void OnExtending (object sender, EventArgs args)
-               {
-                       Process.Start ("https://wiki.gnome.org/Apps/gbrainy/Extending";);
-               }
-
                static void InitCoreLibraries ()
                {
                        new DefaultServices ().RegisterServices ();
diff --git a/src/Clients/Classical/gbrainy.ui b/src/Clients/Classical/gbrainy.ui
index e09d950e..1a8ffcf4 100644
--- a/src/Clients/Classical/gbrainy.ui
+++ b/src/Clients/Classical/gbrainy.ui
@@ -328,15 +328,6 @@
                         <signal name="activate" handler="OnMenuHelp" swapped="no"/>
                       </object>
                     </child>
-                    <child>
-                      <object class="GtkMenuItem" id="extend_menuitem">
-                        <property name="visible">True</property>
-                        <property name="can_focus">False</property>
-                        <property name="label" translatable="yes">How to Extend gbrainy's 
Functionality</property>
-                        <property name="use_underline">True</property>
-                        <signal name="activate" handler="OnExtending" swapped="no"/>
-                      </object>
-                    </child>
                     <child>
                       <object class="GtkImageMenuItem" id="imagemenuitem10">
                         <property name="label">gtk-about</property>