Blog: add personal essay "How I coped with leaving home" (trilingual, prose)

Publish Vasil Handziski's personal essay in MK (original) with EN/SI AI-drafted
translations. Adds a prose article variant (no scrollspy sidebar, centred column,
custom byline) via .article-page--prose, plus blog index cards in all languages.
Converter now omits the "last checked" line when empty.

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

tools/build_blog.py

@@ -168,7 +168,8 @@ def render_body(sections, category, date_label, last_checked_label):
                 for it in val:
                     out.append(f'                        <li>{_inline(it)}</li>')
                 out.append(f'                    </{kind}>')
-    out.append(f'                    <p class="guide-last-checked">{last_checked_label}</p>')
+    if last_checked_label:
+        out.append(f'                    <p class="guide-last-checked">{last_checked_label}</p>')
     return "\n".join(out)