feat: add QR code image and update .gitignore

- Add blog directory to .gitignore
- Add QR code image to images/

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: DanWahlin

.gitignore

@@ -100,4 +100,5 @@ Desktop.ini
 .claude
 .plans
 .plans.vhs-wrapper
-demo-previews
+demo-previews
+blog