Update Allsky.html: Recommend the "Desktop" version of Pi OS.

Author: EricClaeys

html/documentation/installations/Allsky.html

@@ -90,6 +90,7 @@ <h2 id=PreInstallation>Pre installation</h2>
 	<li>If this is a new Pi, you'll need to
 		<a allsky="true" href="../explanations/imageSDcard.html" external="true">
 		install the Raspberry Pi Operating System (OS)</a> on it.
+		We recommend installing the <strong>Desktop</strong> version of Pi OS.
 	<li>Make sure your Pi has a
 		<a href="https://www.raspberrypi.org/documentation/configuration/wireless/wireless-cli.md" external="true">working Internet connection</a>.
 		If you have a choice between a wired LAN and wireless WLAN connection,