feat(seo): wire internal links between the 17 blog posts and the pages that sell

The blog was an island: zero post→page links to hosting/upgrade/support/courses,
and only one page→post link in the whole site. Posts ranked for nothing while the
old blog host ranked for our long-tail queries.

Posts → pages (26 new in-body contextual links across 17 posts):
each post now carries one or two links to the page that answers its reader's next
question — odoo-hosting-2027, odoo-community-upgrade, support, the workshops hub,
the n8n masterclass, and the plan pricing on index.html#pricing.

Pages → posts (7 pages, one contextual link each):
index.html (OCA section), odoo-hosting-2027, odoo-community-upgrade, support,
workshops/, odoo-n8n-masterclass/, odoo-erp-automation-bootcamp/ now link into the
post that fits their own subject. The clearest miss is fixed — the
community-vs-enterprise-cost post and the odoo-community-upgrade page now link
to each other.

Anchors wrap existing sentences where the text already said the thing; four short
linking sentences were added (index OCA section, support first-steps FAQ, masterclass
lessons, bootcamp included section). No new components, no related-posts widget,
in-body anchors only. English pages only; DE/ES untouched (translator follow-up).

workshops/index.html

@@ -545,7 +545,7 @@
           <li>
             <h3>ODOO &times; N8N Masterclass</h3>
             <p class="bc-card-price">USD 120.00 &middot; 2 hours</p>
-            <p>You leave able to make Odoo start its own jobs: an automated action fires on a business event, calls an n8n webhook, and n8n carries the work forward while you are somewhere else.</p>
+            <p>You leave able to make Odoo start its own jobs: <a href="/blog/posts/howto-ai-automation.html">an automated action fires on a business event, calls an n8n webhook</a>, and n8n carries the work forward while you are somewhere else.</p>
             <p class="bc-card-format">Live webinar with a Q&amp;A at the end &middot; Online &middot; English</p>
             <p class="bc-card-cta"><a class="btn btn-brass" href="/odoo-n8n-masterclass/">More Info</a></p>
           </li>