Update the ODOO Community blog post to the live copy

The post carried the planned/September copy ("scheduled to go online on the
06.10.2026"). Body replaced verbatim with the supplied live copy (1379 bytes,
2 h2, 221 words), post-meta -> October 27, 2026 · News, meta/og description
refreshed, title/canonical/chrome/og:image unchanged.

- blog/index.json: the existing entry moved to first, date 2026-10-27,
  teaser = first 120 chars of the new first paragraph (text splice).
- sitemap.xml: one new <url> as the first 0.6 blog entry (24 -> 25 <loc>).
- work/verify-html.py: page added to FILES (in webmaster/work, not in repo).

sitemap.xml

@@ -24,6 +24,12 @@
     <changefreq>monthly</changefreq>
     <priority>0.9</priority>
   </url>
+  <url>
+    <loc>https://odoo4projects.com/blog/posts/odoo-community-is-going-online-on-odoo4projects.html</loc>
+    <lastmod>2026-10-27</lastmod>
+    <changefreq>monthly</changefreq>
+    <priority>0.6</priority>
+  </url>
   <url>
     <loc>https://odoo4projects.com/blog/posts/track-the-oca-modules-you-actually-use.html</loc>
     <lastmod>2026-10-24</lastmod>