ubiquity - Added et-radio and et-mode slides

overlay/usr/share/ubiquity-slideshow/slides/et-radio.html

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+<div class="header"><h1 class="slidetitle">Radio Plug-and-Play</h1></div>
+
+<div class="main">
+
+<div class="text">
+
+<div>
+<p>et-radio supports plug-and-play configuration for several radios.</p>
+
+<ul>
+  <li>Open a terminal.</li>
+  <li>Run "et-radio" and select your radio.</li>
+  <li>Plug in your radio.</li>
+</ul>
+
+<p>No configuration needed for any radio-based application!</p>
+
+</div>
+
+</div>
+
+<img class="screenshot" src="screenshots/et-radio.png" />
+
+</div>