Replace Instagram with BiliBili social icon

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Updated social media links in the README files to include Bilibili.

📊 Key Changes

• Replaced Instagram links with Bilibili links in both the English and Chinese README files.
• Updated corresponding social media icons to reflect this change.

🎯 Purpose & Impact

• Enhanced Regional Engagement: Shift to Bilibili aims to better engage with the Chinese audience, enhancing accessibility and community interaction.
• Improved Awareness: By appearing on a popular Chinese platform, Ultralytics can reach a broader user base and increase brand visibility.

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