Finish the Macedonia stories and enrich image captions

Complete the three remaining Macedonia stories with sourced photos, so
both country sections are now fully illustrated.

Articles (EN/SI/MK each), placeholders replaced with real images:
- A Table Full of Macedonia (shared table, tavče gravče, ajvar,
  pastrmajlija).
- Music, Dance and the Moments That Bring Us Together (oro celebration,
  tapan and zurla, kopachkata, an MSOS event).
- History You Can Still Walk Through (Stobi, Heraclea Lyncestis, Kokino,
  Makedonium).
Each image is center-cropped to a uniform 3:2, downscaled, and given an
attribution caption with place, photographer where known, and source
link.

Captions:
- Replace bare one-word labels with a short descriptive phrase in all
  three languages, so a caption reads "Kokino, a prehistoric megalithic
  observatory" rather than just "Kokino". Applies across the food,
  culture, and heritage stories.
- Support an author-only credit with no external link, used for the
  photo from the MSOS archive.

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

en/get-to-know-slovenia/slovenias-stories-in-stone-and-tradition/index.html

@@ -182,7 +182,7 @@
 
                 <figure class="article-main-image">
                     <img src="../../../images/slovenia-heritage-plecnik-daily-life-hero.jpg" alt="A Plečnik-designed public space beside the Ljubljanica">
-                    <figcaption>Ljubljana. Photo: Dunja Wedam, <a href="https://www.visitljubljana.com/" target="_blank" rel="noopener">visitljubljana.com</a></figcaption>
+                    <figcaption>Plečnik's riverside Ljubljana. Photo: Dunja Wedam, <a href="https://www.visitljubljana.com/" target="_blank" rel="noopener">visitljubljana.com</a></figcaption>
                 </figure>
 
             <div class="article-body">
@@ -228,7 +228,7 @@
 
                 <figure class="article-inline-image">
                     <img src="../../../images/slovenia-heritage-skocjan-caves.jpg" alt="A visitor bridge above the underground river in Škocjan Caves">
-                    <figcaption>Škocjan Caves. Photo: <a href="https://sunsetobsession.com/why-visit-skocjan-caves/" target="_blank" rel="noopener">sunsetobsession.com</a></figcaption>
+                    <figcaption>The Škocjan Caves, a UNESCO World Heritage site. Photo: <a href="https://sunsetobsession.com/why-visit-skocjan-caves/" target="_blank" rel="noopener">sunsetobsession.com</a></figcaption>
                 </figure>
 
                 <h2>Idrija was shaped by mercury</h2>
@@ -282,7 +282,7 @@
 
                 <figure class="article-inline-image">
                     <img src="../../../images/slovenia-heritage-beekeeping.jpg" alt="A Slovenian apiary with painted beehive panels">
-                    <figcaption>A Slovenian apiary. Photo: David Robertson / Alamy, <a href="https://www.atlasobscura.com/articles/what-are-slovenian-beehouses" target="_blank" rel="noopener">atlasobscura.com</a></figcaption>
+                    <figcaption>A traditional Slovenian apiary with painted beehive panels. Photo: David Robertson / Alamy, <a href="https://www.atlasobscura.com/articles/what-are-slovenian-beehouses" target="_blank" rel="noopener">atlasobscura.com</a></figcaption>
                 </figure>
 
                 <h2>Preservation is a present-day decision</h2>