feat: add apple store banner (#6412)

* feat: add apple store banner

* feat: make apple meta tag use the current url

* fix: tag error

* fix: lint

* fix: yarn dedup

* feat: back to basic impl

* fix: syntax

* fix: comment

public/index.html

@@ -25,6 +25,12 @@
       <% } %>
     />
 
+    <!-- 
+      Apple Smart App Banner for Safari on iOS
+      https://developer.apple.com/documentation/webkit/promoting_apps_with_smart_app_banners
+     -->
+    <meta name="apple-itunes-app" content="app-id=6443944476">
+
     <!--
       manifest.json provides metadata used when the app is installed as a PWA.
       See https://developers.google.com/web/fundamentals/web-app-manifest/