Drop reader mode preference.

Author: lwindolf

glade/prefs.ui

@@ -1745,35 +1745,10 @@
                     <property name="visible">True</property>
                     <property name="can-focus">False</property>
                     <child>
-                      <object class="GtkCheckButton" id="readermodebtn">
-                        <property name="label" translatable="yes">Use _Reader mode.</property>
-                        <property name="visible">True</property>
-                        <property name="can-focus">True</property>
-                        <property name="receives-default">False</property>
-                        <property name="halign">start</property>
-                        <property name="margin-start">12</property>
-                        <property name="use-underline">True</property>
-                        <property name="draw-indicator">True</property>
-                        <signal name="toggled" handler="on_readermodebtn_toggled" swapped="no"/>
-                      </object>
-                      <packing>
-                        <property name="expand">False</property>
-                        <property name="fill">True</property>
-                        <property name="position">0</property>
-                      </packing>
+                      <placeholder/>
                     </child>
                     <child>
-                      <object class="GtkLabel">
-                        <property name="visible">True</property>
-                        <property name="can-focus">False</property>
-                        <property name="label" translatable="yes">This enables &lt;a href="https://github.com/mozilla/readability"&gt;stripping&lt;/a&gt; all non-content elements (like scripts, fonts, tracking)</property>
-                        <property name="use-markup">True</property>
-                      </object>
-                      <packing>
-                        <property name="expand">False</property>
-                        <property name="fill">True</property>
-                        <property name="position">1</property>
-                      </packing>
+                      <placeholder/>
                     </child>
                   </object>
                   <packing>