Update retreat info

Author: mkoculak

retreat_2026.html

@@ -29,13 +29,13 @@ <h2>Lusławice, 25th to 29th of March, 2026</h2>
 
 
           <div id="conf-info-box">
-            <div id="conf-info-sub">Registration:</div>
-            <div id="conf-info-con">To be announced</div>
+            <div id="conf-info-sub">Registration end:</div>
+            <div id="conf-info-con">18th March, 2026</div>
           </div>
 
           <div id="conf-info-box">
             <div id="conf-info-sub">Total cost:</div>
-            <div id="conf-info-con">To be announced</div>
+            <div id="conf-info-con">1047,84 PLN</div>
           </div>
 
           <div id="conf-info-box">
@@ -52,7 +52,7 @@ <h2>Lusławice, 25th to 29th of March, 2026</h2>
           <div id="conf-info-box">
           <div id="conf-info-sub">Programme:</div>
           <div id="conf-info-con">
-            To be announced
+            You can find the program (here)[./retreat_2026.pdf].
               <!-- <p><span style="font-weight: 400;">Thursday: </span></p>
               <ul>
                   <li><strong>Paweł Motyka -</strong> Modeling the Stream of Consciousness: A State-Space Framework with VR-Induced Experiential Alterations </li>