Add apple-touch-icon for improved mobile experience

Author: Builder106

front/apple-touch-icon.png

@@ -19,6 +19,7 @@
    <title>OCaml LOB — Matching Engine</title>
    <meta name="description" content="Limit-Order-Book matching engine in OCaml 5 — ~18 M orders/sec, p99 under 1μs, zero bytes allocated per submit (bench-validated). Live demo with a Bloomberg-terminal dashboard.">
    <link rel="icon" type="image/svg+xml" href="/favicon.svg">
+   <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png">
    <link rel="canonical" href="https://ocaml-lob.vercel.app/">
 
    <!-- Open Graph (Slack / iMessage / Discord / LinkedIn / Facebook). -->