Add LeakIX projects and achievements section

[dannywillems]

Summary

Add a section to the sponsor page showcasing what LeakIX is working on and highlighting achievements.

Implementation Details

• Add a section displaying current LeakIX projects/initiatives
• Show achievements and milestones
• Keep the simple, static HTML approach (no JavaScript)
• Mobile-friendly layout

Suggested Content

Projects

• LeakIX search engine
• Zcash Web Wallet
• Security research tools
• Open source contributions

Achievements

• Number of vulnerabilities discovered/reported
• Community size/impact
• Notable security research

Related

• Create LeakIX sponsor page repository zcash-web-wallet#210 - Original sponsor page issue
• Add Stripe payment link #1 - Add Stripe payment link