Blog: add markdown->page converter + new post "Where to search for accommodation" (EN)

tools/build_blog.py converts a Markdown source into the site's scrollspy blog
article (title, header, hero, sidebar nav from ## headings, body). First output:
the new EN post "Where to search for student accommodation in Slovenia", added at
the top of the blog index (newest first), dated 2026-08-03, SEO injected.

MK/SI of this post and the rest of the blog batch (refresh 1-5, split trilingual
posts 2-4, personal essay post 7) still to come.

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

tools/seo_inject.py

@@ -43,6 +43,7 @@ HOME_CRUMB = {"en": "Home", "mk": "Дома", "si": "Domov"}
 # language-independent). Emitted as datePublished/dateModified in Article schema.
 ARTICLE_DATES = {
     "blog/how-to-open-slovenian-bank-account": {"modified": "2026-08-01"},
+    "blog/where-to-search-for-accommodation-in-slovenia": {"published": "2026-08-03"},
     "news/proof-of-means-updated-2026": {"published": "2026-08-01"},
     "projects/humanitarian-tournament-in-maribor": {"published": "2025-04-05"},
     "projects/in-memory-of-frosina-kulakova": {"published": "2025-02-08"},