Add Try it out button for PARI code

Co-authored-by: ckrause <840744+ckrause@users.noreply.github.com>

Author: Copilot

programs.html

@@ -450,6 +450,14 @@ <h1 class="post-title">Integer Sequences and LODA Programs</h1>
         pariButtonsContainer.id = pariButtonsId;
         pariButtonsContainer.className = CSS_CLASSES.PROGRAM_BUTTONS;
 
+        // Add "Try it out" button for PARI
+        const pariTryButton = document.createElement('a');
+        pariTryButton.className = CSS_CLASSES.LODA_BUTTON_SECONDARY;
+        pariTryButton.href = 'https://pari.math.u-bordeaux.fr/gp.html';
+        pariTryButton.target = '_blank';
+        pariTryButton.textContent = 'Try it out';
+        pariButtonsContainer.appendChild(pariTryButton);
+        
         const pariCopyButton = document.createElement('button');
         pariCopyButton.className = CSS_CLASSES.LODA_BUTTON + ' copy';
         pariCopyButton.textContent = 'Copy';