fix: remove duplicate viewport meta tag from headTags

Docusaurus already injects <meta name=viewport> by default from its
core theme. Adding it again via headTags created a duplicate tag.

Removes the redundant entry per Copilot review on PR.

Author: Aryan-B-Parikh

docusaurus.config.js

@@ -53,14 +53,6 @@ module.exports = {
       {name: "twitter:card", content: "summary_large_image"},
     ],
     headTags: [
-      // ── Viewport (mobile performance) ──────────────────────────────────
-      {
-        tagName: "meta",
-        attributes: {
-          name: "viewport",
-          content: "width=device-width, initial-scale=1.0, viewport-fit=cover",
-        },
-      },
       // ── Preconnect / DNS-prefetch for critical third-party origins ─────
       // Keploy CDN
       {