content(MK): apply proofreading corrections from owner + rename header menu

Applies the corrections from "msos web corrections.docx" across 6 Macedonian
pages, plus two global fixes, plus matching English tweaks.

Per-page (MK):
- Landing: hero eyebrow/subtitle, story section, testimonials, FAQ block
- About us / Our team: "Раководен тим" -> "Управен одбор", team names to
  Cyrillic, Marko's title, removed duplicate top gradient + added spacing,
  fixed the broken "Still have questions" footer to match the landing page
- MSOS Hub: title widow (nbsp), hub descriptions
- FAQ: intro + 9 answer corrections (also fixed leftover English fragments)
- Become a Member: card label, removed stats note, consistent "ти" voice,
  Cyrillic names, form step + success text
- Support: title, subtitle, community section, support options

Global (all MK pages): header menu "Нашиот тим, мисија, визија и вредности"
-> "Нашиот тим"; напатница -> напотница. Visible punctuation dashes changed
to commas per owner preference.

English: testimonials section (en/index.html) and two document answers
(en/faq) updated to match.

Adds docs/MK-PROOFREADING.md (6 proofread, 63 remaining of 69 MK pages).

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

mk/student-welcome-guide/master-application/index.html

@@ -79,7 +79,7 @@
                         <a href="#">За нас</a>
                         <ul class="dropdown-menu">
                             <li><a href="../../../mk/timeline-and-milestones/">Времеплов и достигнувања</a></li>
-                            <li><a href="../../../mk/about-us/">Нашиот тим, мисија, визија и вредности</a></li>
+                            <li><a href="../../../mk/about-us/">Нашиот тим</a></li>
                             <li><a href="../../../mk/msos-hub/">МСОС Хаб</a></li>
                         </ul>
                     </li>
@@ -138,7 +138,7 @@
                 <a href="#">За нас</a>
                 <ul class="dropdown-menu">
                     <li><a href="../../../mk/timeline-and-milestones/">Времеплов и достигнувања</a></li>
-                    <li><a href="../../../mk/about-us/">Нашиот тим, мисија, визија и вредности</a></li>
+                    <li><a href="../../../mk/about-us/">Нашиот тим</a></li>
                     <li><a href="../../../mk/msos-hub/">МСОС Хаб</a></li>
                 </ul>
             </li>