Use the updated Apple sample template in the demo

[adeelraza]

Summary

• Replaces demo/src/example/sample.json with the updated Apple template used by the Unlayer Builder and Elements Playgrounds (unlayer/examples#31): dark Apple-style layout, pill Buy button, rounded tiles.
• Uses the new M5 MacBook Pro hero image and updates the chip line to "M5 Pro and M5 Max" to match it.

Testing

• The design JSON is identical to the one in unlayer/examples#31, which loads and renders correctly in the Unlayer editor.
• Not run in this repo's demo.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.43%. Comparing base (c5fc76b) to head (ffe3a86).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #540   +/-   ##
=======================================
  Coverage   97.43%   97.43%           
=======================================
  Files           2        2           
  Lines          78       78           
  Branches       20       20           
=======================================
  Hits           76       76           
  Partials        2        2           

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