feat: add section icons on home page

[zeyuyaoy]

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[Copilot]

Copilot review overview

🟢 Approval recommended

Reviewed changes have no unresolved blocking issues.

Review effort: Lite
Findings: None

What changed in this PR

Adds Radix icons to home-page sections and contribution buttons, replacing obsolete card-arrow indicators.

Changes:

• Add shared icon styling.
• Add icons to guide sections and GitHub/Discord buttons.
• Remove obsolete arrow styles.

File	Description
src/​styles/​home.css	Adds icon styling and removes obsolete arrow styles.
src/​pages/​index.mdx	Adds icons throughout the home page.

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