Feature: Replace OG image

[nick-y-ito]

Overview

Replaced the OG image with the one provided by the designers' team.

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[nick-y-ito]

@ShoeheyOt @kanta1207 Could you review this PR when you have a moment, please? We can't check if it works until we deploy it to production, by the way.

[nick-y-ito]

@kanta1207 Thank you for your prompt review!