fix(docs): route Jira footer link to the docs guide, not sim.ai

Every other integration in the footer's Integrations column links to
its own docs.sim.ai guide; Jira was the only one pointing at the
marketing site's landing page instead, despite docs having its own
/integrations/jira guide. Matches the established pattern.

Author: waleedlatif1

apps/docs/components/footer/footer.tsx

@@ -75,7 +75,7 @@ const INTEGRATION_LINKS: FooterItem[] = [
   { label: 'Gmail', href: '/integrations/gmail' },
   { label: 'Notion', href: '/integrations/notion' },
   { label: 'Salesforce', href: '/integrations/salesforce' },
-  { label: 'Jira', href: `${SIM_SITE_URL}/integrations/jira`, external: true },
+  { label: 'Jira', href: '/integrations/jira' },
   { label: 'Linear', href: '/integrations/linear' },
   { label: 'Supabase', href: '/integrations/supabase' },
   { label: 'Stripe', href: '/integrations/stripe' },