refactor(homepage): align all skill icon panes horizontally

Removed horizontal padding for all skill icon containers to ensure
consistent alignment across the "What You'll Learn" section.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

apps/web/src/app/page.tsx

@@ -371,7 +371,7 @@ export default function HomePage() {
                               bg: 'rgba(255, 255, 255, 0.1)',
                               borderRadius: 'lg',
                               py: i === 0 ? '4' : '2',
-                              px: i === 0 ? '3' : '2',
+                              px: '0',
                             })}
                           >
                             {i === 0 ? <MiniAbacus /> : skill.icon}