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).

blog/posts/howto-ai-automation.html

@@ -217,7 +217,7 @@
                     </ul>
                     <h2>Example: AI-Powered Lead Scoring</h2>
                     <p>
-                        Create an n8n workflow that triggers whenever a new lead
+                        Create an <a href="../../odoo-n8n-masterclass/">n8n workflow</a> that triggers whenever a new lead
                         is created in Odoo CRM. The workflow sends the lead data
                         to an AI model for scoring and enrichment, then updates
                         the lead record with the results.
@@ -235,8 +235,8 @@
                     </div>
                     <h2>Deploy in Minutes</h2>
                     <p>
-                        With ODOO4projects, you can deploy n8n alongside your
-                        Odoo instance with a single click. No complex networking
+                        With ODOO4projects, you can <a href="../../odoo-hosting-2027.html">deploy n8n alongside your
+                        Odoo instance</a> with a single click. No complex networking
                         or security configuration needed &mdash; everything is
                         pre-configured.
                     </p>