feat: update footer socials

[kemuru]

PR-Codex overview

This PR focuses on adding a new YouTube social media entry to the project and includes the corresponding SVG asset for the YouTube logo.

Detailed summary

• Added youtube.svg asset to both web/src/assets/svgs/socialmedia/ and web-devtools/src/assets/svgs/socialmedia/.
• Imported YouTubeLogo in socialmedia.tsx files.
• Added youtube entry to the socialmedia object with URL https://youtube.com/@kleros_io.

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Summary by CodeRabbit

• New Features
  • Added a new YouTube entry to the social media links, allowing users to connect with our content on this platform.
• Changes
  • Removed entries for Etherscan, Ghost Blog, Reddit, and Snapshot from the social media links.
  • Repositioned existing entries for Discord, GitHub, and Telegram within the social media links.