Link "Become a member" CTAs directly to the signup form

Every body CTA (hero buttons, join-cta sections, article sidebars,
activities CTA) now points to become-a-member/#join-form so a click
lands on the form instead of the top of the page. The header menu
tab (btn-secondary) is intentionally left pointing at the page root.

93 links across 45 pages (en/mk/si). HTML-only, self-templated build
preserves the sidebar CTAs, so no rebuild/cache-bust needed.

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

si/projects/teambuilding-hub-opening-2026/index.html

@@ -223,7 +223,7 @@
                 </nav>
                 <div class="sidebar-cta">
                     <p class="sidebar-cta-title">Vam je všeč, kar počnemo?</p>
-                    <a class="sidebar-cta-btn" href="../../../si/become-a-member/">Postani član</a>
+                    <a class="sidebar-cta-btn" href="../../../si/become-a-member/#join-form">Postani član</a>
                     <p class="sidebar-cta-note">Ali <a href="../../../si/support/">podpri MSOS</a> da bomo ustvarili še več takšnih trenutkov.</p>
                 </div>
             </aside>
@@ -321,7 +321,7 @@
                 <h3>Vam je všeč, kar počnemo?</h3>
                 <p>Postani član ali podpri MSOS, da bomo ustvarili še več takšnih trenutkov.</p>
                 <div class="asc-actions">
-                    <a class="btn btn-primary-orange" href="../../../si/become-a-member/">Postani član</a>
+                    <a class="btn btn-primary-orange" href="../../../si/become-a-member/#join-form">Postani član</a>
                     <a class="btn btn-secondary" href="../../../si/support/">Podpri MSOS</a>
                 </div>
             </div>