ubiquity - Added et-reticulum to the installer slide show

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

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+<div class="header"><h1 class="slidetitle">Reticulum</h1></div>
+
+<div class="main">
+
+<div class="text">
+
+<div>
+<p><b>et-reticulum</b> provides plug-and-play support for running the Reticulum Network Stack (RNS) with zero configuration. It includes sample "blueprint" configurations for quickly starting a Reticulum node that can communicate over LoRa, packet radio, modem73, the Mercury HF modem, Wi-Fi, Ethernet, and even the Internet—if you must.
+</p>
+
+<p>The Heltec v4 is the officially supported LoRa device for EmComm Tools.</p>
+</div>
+
+</div>
+
+<img class="screenshot" src="screenshots/et-predict.png" />
+
+</div>

overlay/usr/share/ubiquity-slideshow/slides/index.html

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 		<div><a href="et-predict.html"></a></div>
 		<div><a href="et-mail.html"></a></div>
 		<div><a href="et-aircraft.html"></a></div>
+		<div><a href="et-reticulum.html"></a></div>
 	</div>
 
 	<div id="controls">