Remove manifest.json (#131)

public/index.html

@@ -7,14 +7,8 @@
       content="width=device-width, initial-scale=1, shrink-to-fit=no"
     />
     <meta name="theme-color" content="#000000" />
-    <!--
-      manifest.json provides metadata used when your web app is added to the
-      homescreen on Android. See https://developers.google.com/web/fundamentals/engage-and-retain/web-app-manifest/
-    -->
-    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
 
     <link rel="icon" href="%PUBLIC_URL%/logo.png" />
-    <!-- <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico" /> -->
     <link
       rel="preload"
       href="https://uploads.codesandbox.io/uploads/user/ed077012-e728-4a42-8395-cbd299149d62/AflB-FG_Virgil.ttf"
@@ -22,15 +16,6 @@
       type="font/ttf"
       crossorigin="anonymous"
     />
-    <!--
-      Notice the use of %PUBLIC_URL% in the tags above.
-      It will be replaced with the URL of the `public` folder during the build.
-      Only files inside the `public` folder can be referenced from the HTML.
-
-      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
-      work correctly both with client-side routing and a non-root public URL.
-      Learn how to configure a non-root public URL by running `npm run build`.
-    -->
     <title>Excalidraw</title>
 
     <script