add GFSS2025 + remove IRC channel

index.html

@@ -87,11 +87,6 @@
     <h3>Contribute</h3>
     <ul class="mb-2">
       <li>
-        <a href="https://web.libera.chat/?channels=#gf">
-          <i class="fas fa-hashtag"></i>
-          IRC
-        </a>
-        /
         <a href="https://discord.gg/EvfUsjzmaz">
           <i class="fab fa-discord"></i>
           Discord
@@ -232,14 +227,10 @@ least one, it may help you to get a first idea of what GF is.
     </p>
 
     <p>
-    We run the IRC channel <strong><code>#gf</code></strong> on the Libera network, where you are welcome to look for help with small questions or just start a general discussion.
-    You can <a href="https://web.libera.chat/?channels=#gf">open a web chat</a>
-    or <a href="https://www.grammaticalframework.org/irc/?C=M;O=D">browse the channel logs</a>.
-    </p>
-    <p>
-    There is also a <a href="https://discord.gg/EvfUsjzmaz">GF server on Discord</a>.
+    We run the <a href="https://discord.gg/EvfUsjzmaz">GF server on Discord</a>, where you are welcome to look for help with small questions or just start a general discussion.
     </p>
 
+
     <p>
     For bug reports and feature requests, please create an issue in the
     <a href="https://github.com/GrammaticalFramework/gf-core/issues">GF Core</a> or
@@ -254,6 +245,10 @@ least one, it may help you to get a first idea of what GF is.
   <div class="col-md-6">
     <h2>News</h2>
     <dl class="row">
+      <dt class="col-sm-3 text-center text-nowrap">2025-01-18</dt>
+      <dd class="col-sm-9">
+        <a href="//school.grammaticalframework.org/2025/">9th GF Summer School</a>, in Gothenburg, Sweden, 18 &ndash; 29 August 2025.
+      </dd>
       <dt class="col-sm-3 text-center text-nowrap">2023-01-24</dt>
       <dd class="col-sm-9">
         <a href="//school.grammaticalframework.org/2023/">8th GF Summer School</a>, in Tampere, Finland, 14 &ndash; 25 August 2023.