[libhandy] demo: Drop useless header labels

[Alexander Mikhaylenko <alexm src gnome org>]

commit caa1ae6fe3523785367aa76540e795cc0ac32bef
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Mon Nov 30 17:20:27 2020 +0100

    demo: Drop useless header labels
    
    They were duplicating the title, hence they were providing no
    information, hence they were just noise we should get rid of.

 examples/hdy-demo-window.ui | 70 ---------------------------------------------
 1 file changed, 70 deletions(-)
---
diff --git a/examples/hdy-demo-window.ui b/examples/hdy-demo-window.ui
index 9d00588f..311ac258 100644
--- a/examples/hdy-demo-window.ui
+++ b/examples/hdy-demo-window.ui
@@ -515,20 +515,6 @@
                                 </child>
                               </object>
                             </child>
-                            <child>
-                              <object class="GtkLabel">
-                                <property name="visible">True</property>
-                                <property name="can_focus">False</property>
-                                <property name="expand">True</property>
-                                <property name="label" translatable="yes">Leaflet</property>
-                                <property name="justify">left</property>
-                                <property name="halign">start</property>
-                                <property name="margin-bottom">12</property>
-                                <attributes>
-                                  <attribute name="weight" value="bold"/>
-                                </attributes>
-                              </object>
-                            </child>
                             <child>
                               <object class="GtkListBox">
                                 <property name="visible">True</property>
@@ -657,20 +643,6 @@
                                     </child>
                                   </object>
                                 </child>
-                                <child>
-                                  <object class="GtkLabel">
-                                    <property name="visible">True</property>
-                                    <property name="can_focus">False</property>
-                                    <property name="expand">True</property>
-                                    <property name="label" translatable="yes">Deck</property>
-                                    <property name="justify">left</property>
-                                    <property name="halign">start</property>
-                                    <property name="margin-bottom">12</property>
-                                    <attributes>
-                                      <attribute name="weight" value="bold"/>
-                                    </attributes>
-                                  </object>
-                                </child>
                                 <child>
                                   <object class="GtkListBox">
                                     <property name="visible">True</property>
@@ -1039,20 +1011,6 @@
                                 </child>
                               </object>
                             </child>
-                            <child>
-                              <object class="GtkLabel">
-                                <property name="visible">True</property>
-                                <property name="can_focus">False</property>
-                                <property name="expand">True</property>
-                                <property name="label" translatable="yes">Clamp</property>
-                                <property name="justify">left</property>
-                                <property name="halign">start</property>
-                                <property name="margin-bottom">12</property>
-                                <attributes>
-                                  <attribute name="weight" value="bold"/>
-                                </attributes>
-                              </object>
-                            </child>
                             <child>
                               <object class="GtkListBox" id="clamp_listbox">
                                 <property name="visible">True</property>
@@ -1193,20 +1151,6 @@
                                 </child>
                               </object>
                             </child>
-                            <child>
-                              <object class="GtkLabel">
-                                <property name="visible">True</property>
-                                <property name="can_focus">False</property>
-                                <property name="expand">True</property>
-                                <property name="label" translatable="yes">Lists</property>
-                                <property name="justify">left</property>
-                                <property name="halign">start</property>
-                                <property name="margin-bottom">12</property>
-                                <attributes>
-                                  <attribute name="weight" value="bold"/>
-                                </attributes>
-                              </object>
-                            </child>
                             <child>
                               <object class="GtkListBox" id="lists_listbox">
                                 <property name="visible">True</property>
@@ -2203,20 +2147,6 @@
                                 </child>
                               </object>
                             </child>
-                            <child>
-                              <object class="GtkLabel">
-                                <property name="visible">True</property>
-                                <property name="can_focus">False</property>
-                                <property name="expand">True</property>
-                                <property name="label" translatable="yes">Window</property>
-                                <property name="justify">left</property>
-                                <property name="halign">start</property>
-                                <property name="margin-bottom">12</property>
-                                <attributes>
-                                  <attribute name="weight" value="bold"/>
-                                </attributes>
-                              </object>
-                            </child>
                             <child>
                               <object class="GtkListBox">
                                 <property name="visible">True</property>