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).

blog/index.json

@@ -1,5 +1,13 @@
 {
   "posts": [
+    {
+      "id": "odoo-community-is-going-online-on-odoo4projects",
+      "date": "2026-10-27",
+      "area": "news",
+      "headline": "ODOO Community Is Going Online on ODOO4projects",
+      "teaser": "ODOO Community is online. Behind that switch we spent the last weeks upgrading our server modules, so every ODOO4project",
+      "link": "blog/posts/odoo-community-is-going-online-on-odoo4projects.html"
+    },
     {
       "id": "track-the-oca-modules-you-actually-use",
       "date": "2026-10-24",
@@ -34,14 +42,6 @@
       "teaser": "Two weeks. That is how long it took us to bring up Odoo 20 on our servers, with all of the new features that come with i",
       "link": "blog/posts/odoo-20-is-live-on-our-servers-with-an-mcp-server-and-free-backups.html"
     },
-    {
-      "id": "odoo-community-is-going-online-on-odoo4projects",
-      "date": "2026-09-28",
-      "area": "news",
-      "headline": "ODOO Community Is Going Online on ODOO4projects",
-      "teaser": "ODOO Community is scheduled to go online on the 06.10.2026. Alongside that step, the team behind ODOO4projects is workin",
-      "link": "blog/posts/odoo-community-is-going-online-on-odoo4projects.html"
-    },
     {
       "id": "community-vs-enterprise-cost",
       "date": "2026-06-27",