feat(footer): add Odoo Freelancer Directory to Useful Links; drop the directory page's bottom Start CTA

- 13 tracked pages + the directory page's footer carry a new <li>
  <a href="/odoo-community-developers/">Odoo Freelancer Directory</a>,
  placed after "ODOO Hosting in 2027" (our service links together, before Support/Legal).
- The directory page itself is excluded (a page does not link to itself in its own footer).
- Removed the final Start / "Browse the freelancers" CTA section from the directory page;
  the hero copy keeps its one "Browse the freelancers" link. .cmp-cta CSS untouched (11 pages).

what-can-i-use-odoo-for/index.html

@@ -913,6 +913,7 @@
             <ul>
               <li><a href="/odoo-erp-automation-bootcamp/">ODOO Bootcamp</a></li>
               <li><a href="/odoo-hosting-2027.html">ODOO Hosting in 2027</a></li>
+              <li><a href="/odoo-community-developers/">Odoo Freelancer Directory</a></li>
               <li><a href="/support.html">Support</a></li>
               <li><a href="/legal.html">Legal</a></li>
             </ul>