fix(news): style Sources lists with guide-linklist across articles

The Sources sections on the Welcome Days, accommodation-search and
Ad futura scholarship articles used bare <ul>/<ol> lists, which rendered
as default bullets/numbers with plain blue links instead of the site's
standard source-list style (chain icon, teal links, row dividers).

Add class="guide-linklist" to the Sources lists (converting Ad futura's
<ol> to <ul>) in the content/ source markdown and the generated en/mk/si
pages, matching the Student Welcome Guide. Edits scoped to the affected
articles to avoid unrelated build-tool reformatting churn.

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

en/blog/where-to-search-for-accommodation-in-slovenia/index.html

@@ -312,7 +312,7 @@
                     <p>Read more on the <a href="../../../en/student-welcome-guide/student-accommodation/">accommodation page of the Student Welcome Guide</a>.</p>
                     <p>MSOS can share student experience and help you understand where to look, but the university, landlord, upravna enota, or other responsible institution must confirm your individual administrative requirements.</p>
                     <h2 id="sources">Sources</h2>
-                    <ul>
+                    <ul class="guide-linklist">
                         <li><a href="https://studyinslovenia.si/live/accomodation/" target="_blank" rel="noopener">Study in Slovenia, Accommodation</a></li>
                         <li><a href="https://www.uni-lj.si/en/study/international-students/accommodation-transport-and-cost-of-living" target="_blank" rel="noopener">University of Ljubljana, Accommodation, transport and cost of living</a></li>
                         <li><a href="https://www.erasmusplus.um.si/international-students/useful-information/accomodation/" target="_blank" rel="noopener">University of Maribor, Accommodation for international students</a></li>