Make the About/"Learn more" home CTA a descriptive link

Lighthouse SEO flagged the EN "Learn more" -> /en/about-us/ link as
non-descriptive; renamed to "Learn more about MSOS". The MK/SI
equivalents were dead <button>s (no href, no JS handler) — converted
them to real links to their about-us page with descriptive text
("Дознај повеќе за МСОС" / "Več o MSOS").

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

si/index.html

@@ -268,7 +268,7 @@
             <div class="team-content">
                 <h2>Spoznajte našo izjemno ekipo!</h2>
                 <p>Naša filozofija je preprosta, zaposliti ekipo raznolikih, strastnih ljudi in gojiti kulturo, ki vas opolnomoči, da opravite svoje najboljše delo.</p>
-                <button class="btn btn-secondary">Več o tem</button>
+                <a href="../si/about-us/" class="btn btn-secondary">Več o MSOS</a>
             </div>
         </section>