style(docs): drop Funnel Display, headings use regular Lato

User feedback: the Funnel Display headings should use a regular font.
--font-display now resolves to Lato (same as body); Funnel Display
removed from the Google Fonts load. Lato + JetBrains Mono remain.

Author: Sentinel-Bluebuilder

docs/index.html

@@ -70,7 +70,7 @@
 
 <link rel="preconnect" href="https://fonts.googleapis.com">
 <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
-<link href="https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700&family=Funnel+Display:wght@300..800&family=Lato:wght@300;400;700;900&display=swap" rel="stylesheet">
+<link href="https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700&family=Lato:wght@300;400;700;900&display=swap" rel="stylesheet">
 <style>
 /* ─── Reset & Variables ─── */
 *, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
@@ -114,7 +114,7 @@
   --red: #ff5d6c;
 
   --font-body: 'Lato', -apple-system, sans-serif;
-  --font-display: 'Funnel Display', 'Lato', -apple-system, sans-serif;
+  --font-display: 'Lato', -apple-system, sans-serif;
   --font-mono: 'JetBrains Mono', 'SF Mono', ui-monospace, monospace;
   --radius: 8px;
   --radius-lg: 12px;