Add Student Welcome Guide, legal pages, and working newsletter

Student Welcome Guide (Phase 1):
- Landing + 5 topic pages (journey, bachelor, master, deadlines, eVS)
  in EN/SI/MK, reusing the article auto-TOC
- New css/pages/_guide.css components and a 3:1 hero image placeholder
- Functional client-side "Build my route" tool (student-guide.js)
- "Student Welcome Guide" menu link wired site-wide

Legal pages:
- Trilingual Privacy Policy and Cookie Policy (GDPR-oriented,
  MailerLite disclosed, IP RS complaint route)
- Footer legal strip + Organisation column links wired site-wide,
  depth-aware, plus header/footer templates

Newsletter:
- MailerLite subscribe handler in main.js upgrades both form variants
  on every page: validation, double opt-in, inline trilingual status
- Subscribe status styles in css/pages/_projects.css

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

en/about-us/index.html

@@ -55,7 +55,7 @@
                     <li class="menu-item menu-item-has-children">
                         <a href="#">For Students</a>
                         <ul class="dropdown-menu">
-                            <li><a href="#">Student Welcome Guide</a></li>
+                            <li><a href="../../en/student-welcome-guide/">Student Welcome Guide</a></li>
                             <li><a href="#">Mentorship Programme</a></li>
                             <li><a href="#">FAQs</a></li>
                             <li><a href="../../en/get-to-know-slovenia/">Get to know Slovenia</a></li>
@@ -127,7 +127,7 @@
             <li class="menu-item menu-item-has-children">
                 <a href="#">For Students</a>
                 <ul class="dropdown-menu">
-                    <li><a href="#">Student Welcome Guide</a></li>
+                    <li><a href="../../en/student-welcome-guide/">Student Welcome Guide</a></li>
                     <li><a href="#">Mentorship Programme</a></li>
                     <li><a href="#">FAQs</a></li>
                     <li><a href="../../en/get-to-know-slovenia/">Get to know Slovenia</a></li>
@@ -379,6 +379,8 @@
                     <a href="#">About us</a>
                     <a href="#">Contact</a>
                     <a href="#">Documentation</a>
+                    <a href="../../en/privacy-policy/">Privacy policy</a>
+                    <a href="../../en/cookie-policy/">Cookie Policy</a>
                 </div>
             </div>
         </div>
@@ -386,8 +388,8 @@
         <div class="footer-bottom">
              <p>© MSOS org 2025 All rights reserved.</p>
             <div class="legal-links">
-                <a href="#">Privacy policy</a>
-                <a href="#">Cookie Policy</a>
+                <a href="../../en/privacy-policy/">Privacy policy</a>
+                <a href="../../en/cookie-policy/">Cookie Policy</a>
                 <a href="#">Legal Terms</a>
             </div>
         </div>