feat(site): publish /odoo-community-upgrade.html (EN Odoo Community Upgrade page)

New EN landing page for the head term "ODOO Community Upgrade": hero, what an
upgrade is, the 10-step published process, a developer-labelled technical section
with four sourced command blocks and their substitution notes, the ODOO4projects
migration service (new database on our servers), the self-hosting cost honesty
section, an 8-question FAQ and a final CTA. House CI only, page-scoped CSS, no
new blocking resources.

- CTAs are plain links to the real flows: /support.html#contact (opens the
  migration ticket) and /index.html#pricing. No basket POST and no product id:
  no price is published for the migration service, so wiring a buy would invent one.
- JSON-LD: WebPage + Service + FAQPage (8 questions), no Offer node.
- sitemap.xml: new URL added; llms.txt: page listed under Key pages.
- support.html: the "older version" FAQ answer now links the new page so it is not orphaned.

Copy: copywriter/out/odoo-community-upgrade-page-copy-2026-10-27.md. The 7
NOT PUBLISHED gaps (G1-G7) are not in the build.

support.html

@@ -485,6 +485,7 @@
                         </button>
                         <div class="faq-answer">
                             <p>Yes, we can help you upgrade your database from older versions to a supported release (17, 18, or 19), but only after reviewing your database to ensure compatibility. Please submit a support ticket to start the process.</p>
+                            <p>The full process, and the commands a developer would run, are explained on our <a href="odoo-community-upgrade.html">Odoo Community upgrade page</a>.</p>
                         </div>
                     </div>
                 </div>