Add trophy after installing USB stick

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

+<div class="trophy windows linux mac-usb expert">
+
+<div class="state-image">[[!img install/inc/infography/tails-usb.png link="no" alt="Tails USB stick"]]</div>
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+<p>Congratulations, you have installed Tails on your USB stick!</p>
+
+<p>You will now restart your computer on this USB stick.
+<span class="windows linux expert">It can be a bit complicated, so good luck!</span>
+<span class="mac-usb">But it might not work on your Mac model, so good luck!</span>
+</p>
+
+</div>
+
 <h1 id="back">Open these instructions on another device</h1>
 
 <div class="step-image">[[!img install/inc/infography/switch-context.png link="no" alt=""]]</div>