Fix step images on 'linux' and 'upgrade'

wiki/src/install/inc/steps/install_with_gnome_disks.inline.mdwn

@@ -15,12 +15,22 @@
 
    [[!img install/inc/icons/gnome-disks.png link="no" alt=""]]
 
+   <div class="step-image">
+     [[!img install/inc/infography/plug-usb.png link="no" class="linux" alt="USB stick plugged in the computer"]]
+     [[!img install/inc/infography/plug-upgrade-usb.png link="no" class="upgrade" alt=""]]
+   </div>
+
 1. Plug in the <span class="upgrade">intermediary</span> USB stick <span class="linux">on which you want to install Tails</span>.
 
    A new drive appears in the left pane. Click on it.
 
    [[!img install/inc/screenshots/gnome_disks_drive.png link="no" alt=""]]
 
+   <div class="step-image">
+     [[!img install/inc/infography/install-tails.png link="no" class="linux" alt=""]]
+     [[!img install/inc/infography/install-upgrade-usb.png link="no" class="upgrade" alt=""]]
+   </div>
+
 1. Click on the
    [[!img lib/open-menu.png alt="Menu" class="symbolic" link="no"]] button in
    the titlebar and choose

wiki/src/install/linux/usb.mdwn

@@ -33,8 +33,6 @@ In this step, you will install Tails on a USB stick using
    - Otherwise, install the <span class="code">gnome-disk-utility</span>
      package using the usual installation method for your distribution.
 
-<div class="step-image">[[!img install/inc/infography/install-tails.png link="no" alt=""]]</div>
-
 [[!inline pages="install/inc/steps/install_with_gnome_disks.inline" raw="yes" sort="age"]]
 
 [[!inline pages="install/inc/steps/restart_first_time.inline" raw="yes" sort="age"]]

wiki/src/upgrade/tails.mdwn

@@ -31,8 +31,6 @@ copied.</p>
 
 </div>
 
-<div class="step-image">[[!img install/inc/infography/plug-upgrade-usb.png link="no" alt=""]]</div>
-
 [[!inline pages="install/inc/steps/install_with_gnome_disks.inline" raw="yes" sort="age"]]
 
 [[!inline pages="install/inc/steps/restart_first_time.inline" raw="yes" sort="age"]]