fixed year / links for giggity / ics instructions

diff --git a/2023/program/app.html b/2023/program/app.html
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@@ -6,9 +6,9 @@
 <h1>Program <small>Other ways to use the schedule</small></h1>
 <!--#include virtual="/2023/includes/program-menu.html"-->
 
-<p><strong>Install the Giggity app</strong> on Replicant or Android. The LibrePlanet 2020 schedule will appear at the top of the app's home screen.</p>
+<p><strong>Install the Giggity app</strong> on Replicant or Android. The LibrePlanet 2023 schedule will appear at the top of the app's home screen.</p>
 
-<p><strong>Download the calendar file</strong> (free iCal format) from <a href="https://libreplanet.org/2020/lp2020-schedule.ics">https://libreplanet.org/2020/lp2020-schedule.ics</a> and import it to any calendar program. On Replicant and Android devices, you can subscribe to the calendar file with Etar and ICSdroid (the Libreplanet schedule must show up in the &ldquo;Agenda&rdquo; view on Etar).</p>
+<p><strong>Download the calendar file</strong> (free iCal format) from <a href="https://libreplanet.org/2023/lp2023-schedule.ics">https://libreplanet.org/2023/lp2023-schedule.ics</a> and import it to any calendar program. On Replicant and Android devices, you can subscribe to the calendar file with Etar and ICSdroid (the Libreplanet schedule must show up in the &ldquo;Agenda&rdquo; view on Etar).</p>
 
 <p>We recommend you install Android/Replicant apps from the <a href="https://f-droid.org">F-Droid</a> free software app repository instead of the Google Play store.</p>