Homepage refresh, activities redesign + newsletter rollout

Navigation
- Replace "Donate" with a "Support MSOS ❤️" CTA site-wide
- Remove dead nav links (Gallery, Press releases)
- Turn the one-item News dropdown into a direct link

Homepage
- Replace the non-functional "Become part" contact form with a
  "Find your people in Slovenia" join CTA (blue/white gradient band,
  orange button, photo collage), in all three languages
- Fix the placeholder Activities subtitle
- Redesign Activities into card-style tabs with icons; move per-tab
  content into HTML panels and switch by index so the tabs work in
  every language (MK/SI tabs were previously dead)

Newsletter (MailerLite)
- Add the subscribe block to the News hub, news articles, and every
  events/projects page and hub, in all three languages
- Resize/rebalance the block, shrink the privacy line, add top spacing
- Standardise on honest copy (drop the "2,000+ subscribers" claim)
- Load main.js on the News hub pages (they shipped without it, so the
  form and header dropdowns didn't work there)
- Fix a dead privacy-policy link on the makedonska-vecer page
- Document the signup convention in docs/newsletter-signup.md

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

mk/faq/index.html

@@ -42,7 +42,6 @@
                         <ul class="dropdown-menu">
                             <li><a href="../../mk/projects/">Настани и проекти</a></li>
                             <li><a href="../../mk/blog/">Блог</a></li>
-                            <li><a href="#">Галерија</a></li>
                         </ul>
                     </li>
 
@@ -55,18 +54,12 @@
                             <li><a href="../../mk/get-to-know-macedonia/">Запознај ја Македонија</a></li>
                         </ul>
                     </li>
-                    <li class="menu-item menu-item-has-children">
-                        <a href="#">Новости</a>
-                        <ul class="dropdown-menu">
-                            <li><a href="../../mk/news/">Вести и соопштенија</a></li>
-                            <li><a href="#">Соопштенија за медиуми</a></li>
-                        </ul>
-                    </li>
+                    <li class="menu-item"><a href="../../mk/news/">Новости</a></li>
                 </ul>
             </nav>
             <div class="navigation-actions">
                 <a href="../../mk/become-a-member/" class="btn btn-secondary">Стани член</a>
-                <button class="btn btn-primary">Донирај</button>
+                <button class="btn btn-primary">Поддржи го МСОС ❤️</button>
                 <div class="language-selector">
                     <div class="current-lang">
                         <i class="fas fa-globe"></i>
@@ -106,7 +99,6 @@
                 <ul class="dropdown-menu">
                     <li><a href="../../mk/projects/">Настани и проекти</a></li>
                     <li><a href="../../mk/blog/">Блог</a></li>
-                    <li><a href="#">Галерија</a></li>
                 </ul>
             </li>
 
@@ -119,18 +111,12 @@
                     <li><a href="../../mk/get-to-know-macedonia/">Запознај ја Македонија</a></li>
                 </ul>
             </li>
-            <li class="menu-item menu-item-has-children">
-                <a href="#">Новости</a>
-                <ul class="dropdown-menu">
-                    <li><a href="../../mk/news/">Вести и соопштенија</a></li>
-                    <li><a href="#">Соопштенија за медиуми</a></li>
-                </ul>
-            </li>
+            <li class="menu-item"><a href="../../mk/news/">Новости</a></li>
         </ul>
     </nav>
     <div class="navigation-actions">
         <a href="../../mk/become-a-member/" class="btn btn-secondary">Стани член</a>
-        <button class="btn btn-primary">Донирај</button>
+        <button class="btn btn-primary">Поддржи го МСОС ❤️</button>
         <div class="language-selector">
             <button class="current-lang" id="mobile-lang-trigger">
                 <i class="fas fa-globe"></i>