docs: remove hero terminal glow pseudo-element

The ::before with inset: -50px created a visible rectangular
artifact behind the hero terminal block.

Author: franckferman

docs/index.html

@@ -253,22 +253,6 @@
       position: relative;
     }
 
-    .hero-terminal-wrap::before {
-      content: '';
-      position: absolute;
-      inset: -50px;
-      background:
-        radial-gradient(ellipse at 50% 40%, rgba(61,142,248,.22) 0%, transparent 55%),
-        radial-gradient(ellipse at 20% 80%, rgba(34,211,238,.1) 0%, transparent 45%);
-      pointer-events: none;
-      z-index: -1;
-      animation: hero-glow 6s ease-in-out infinite alternate;
-    }
-
-    @keyframes hero-glow {
-      0%   { opacity: .8; }
-      100% { opacity: 1; }
-    }
 
     .terminal {
       background: var(--bg-code);