fix(landing): complete rebrand in blog fallback description

Remove "workflows" from the non-tagged blog meta description to
align with the AI workspace rebrand across the rest of the PR.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: waleedlatif1

apps/sim/app/(landing)/blog/page.tsx

@@ -20,7 +20,7 @@ export async function generateMetadata({
 
   const description = tag
     ? `Sim blog posts tagged "${tag}" — insights and guides for building AI agents.`
-    : 'Announcements, insights, and guides for building AI agent workflows.'
+    : 'Announcements, insights, and guides for building AI agents.'
 
   const canonicalParams = new URLSearchParams()
   if (tag) canonicalParams.set('tag', tag)