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>

css/pages/_projects.css

@@ -93,6 +93,18 @@
     font-weight: 500;
 }
 
+/* Newsletter subscription status message */
+.subscribe-status {
+    max-width: 520px;
+    margin: 10px auto 0;
+    font-size: 14px;
+    font-weight: 500;
+    line-height: 20px;
+}
+.subscribe-status.is-info { color: #667085; }
+.subscribe-status.is-success { color: #067647; }
+.subscribe-status.is-error { color: #B42318; }
+
 /* 1b. Filter kategorij (pill navigacija + podfiltri) */
 
 .filter-section {