Add Japanese Okonomiyaki to traditional food

[travisbreaks]

Summary

Adds Okonomiyaki to world-traditional-food.md under Asia > Japan:

• Description of the dish ("grilled as you like it" savory pancake)
• Osaka vs Hiroshima style differences
• Traditional toppings: okonomiyaki sauce, Japanese mayo, bonito flakes, aonori
• Cultural context as street food and teppan restaurant staple

Closes #86

Co-authored-by: Egger egger@horny-toad.com

[github-actions]

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[adiati98]

Hey @travisbreaks,
Thank you for taking on this! We appreciate your contribution. ✨

However, as mentioned in our "How to Contribute" section on the README:

We only receive one added item per file and one PR for each open issue per contributor.

You've submitted PR #127. Therefore, we're closing this PR.

Thank you for your understanding.