How I built Footy Kits Battle with Next.js, Supabase, and Gemini image-to-image (as a 16-year-old)

I spent the last three months building footykitsbattle.com — a World Cup 2026 kit voting site that's now sitting at ~700 static pages, 42 team pages, 25 three-way compare pages, 86 blog posts, and a live Supabase-backed leaderboard showing which kits fans are voting for. I'm 16. I'm based in the UK.