fix lcp n eliminate render blocking fonts via next/font

[IbrahimAhmed8]

Resolves the final documentation performance issues outlined in #8

Changes applied:

• LCP Optimization: Removed opacity: 0 from the initial state of the above-the-fold motion wrappers in DocsHomePage and DocsArticlePage. This allows the largest text elements to paint immediately at full opacity, eliminating the LCP penalty
• Render-Blocking Fonts: Migrated global fonts (Inter, Space Grotesk, Bebas Neue, JetBrains Mono) to Next.js next/font within the root layout.tsx. Enforced display: 'swap' on all instances to prevent invisible text during font loading (FOIT)
• Below-the-fold: Kept original whileInView opacity animations for lower sections to preserve visual pacing without affecting initial load metrics

Tested locally. tsc --noEmit passes cleanly. All items in Issue #8 are now complete

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