Fix: remove deprecated meta tag (#4191)

src/pages/_document.jsx

@@ -8,7 +8,7 @@ export default function Document() {
           name="description"
           content="A highly customizable homepage (or startpage / application dashboard) with Docker and service API integrations."
         />
-        <meta name="apple-mobile-web-app-capable" content="yes" />
+        <meta name="mobile-web-app-capable" content="yes" />
         <link rel="manifest" href="/site.webmanifest?v=4" crossOrigin="use-credentials" />
       </Head>
       <body>