ubiquity - Added et-radio and et-mode slides

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

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+<div class="header"><h1 class="slidetitle">Zero Configuration</h1></div>
+
+<div class="main">
+
+<div class="text">
+
+<div>
+<p>et-mode supports zero-configuration when running your favorite radio applications and modes.</p>
+
+<ul>
+  <li>Open a terminal.</li>
+  <li>Run "et-mode" and select an application</li>
+</ul>
+
+<p>No configuration. Just operate!</p>
+
+<p>For JS8Call or fldigi, just click the desktop icon.</p>
+
+</div>
+
+</div>
+
+<img class="screenshot" src="screenshots/et-mode.png" />
+
+</div>