Blog: post 6 "Accommodation" now trilingual (MK/SI AI-drafted)

Add Macedonian and Slovenian versions of the accommodation post (AI-drafted,
flagged for native review), rebuild EN with a proper Student Welcome Guide link
and a real Sources section, and add MK/SI blog index cards. Converter now treats
a secondary "# Sources" heading as a section.

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

tools/build_blog.py

@@ -82,6 +82,8 @@ def parse_markdown(md):
             break
     else:
         body_lines = lines
+    # Any further level-1 heading (e.g. "# Sources") becomes a real section.
+    body_lines = [("## " + ln[2:]) if ln.startswith("# ") else ln for ln in body_lines]
 
     sections = []  # list of dict(id, heading, blocks[])
     cur = {"id": "", "heading": None, "blocks": []}