Update Claude Code course link to cohort 3 and add guide images

- Update announcement bar link to claude-code-for-everyone-cohort-3
- Change coupon code to EARLYBIRDCC3
- Add Claude Code guide images to img/claude-code/

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: omarsar

components/AnnouncementBar.tsx

@@ -34,9 +34,9 @@ const AnnouncementBar: React.FC = () => {
         display: isMenuOpen ? 'none' : 'block',
       }}
     >
-      🚀 Master building AI workflows and agents with Claude Code! Use <strong style={{ fontWeight: 'bold' }}>AGENTX20</strong> for 20% off{' '}
+      🚀 Master building AI workflows and agents with Claude Code! Use <strong style={{ fontWeight: 'bold' }}>EARLYBIRDCC3</strong> for 20% off{' '}
       <Link
-        href="https://dair-ai.thinkific.com/courses/claude-code-for-everyone-2"
+        href="https://dair-ai.thinkific.com/courses/claude-code-for-everyone-cohort-3"
         target="_blank"
         rel="noopener noreferrer"
         style={{