Add v3 Page 29: student organisations and extracurricular life (Batch 5)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

en/student-welcome-guide/index.html

@@ -251,6 +251,7 @@
                     <a class="guide-quicklink" href="study-cities/"><i class="fas fa-city" aria-hidden="true"></i>Study cities</a>
                     <a class="guide-quicklink" href="student-budget/"><i class="fas fa-wallet" aria-hidden="true"></i>Budget and daily life</a>
                     <a class="guide-quicklink" href="wellbeing-and-community/"><i class="fas fa-hands-holding-circle" aria-hidden="true"></i>Wellbeing and community</a>
+                    <a class="guide-quicklink" href="student-organisations-and-extracurriculars/"><i class="fas fa-people-group" aria-hidden="true"></i>Student organisations</a>
                     <a class="guide-quicklink" href="renew-change-graduate/"><i class="fas fa-arrows-rotate" aria-hidden="true"></i>Renewal and graduation</a>
                     <a class="guide-quicklink" href="official-sources-and-checklists/"><i class="fas fa-list-ul" aria-hidden="true"></i>Official sources</a>
             </div>