Update migration videos and some info (#734)

* Update files and text

* update videos to w648px cde8dff

404.html

@@ -13,11 +13,11 @@
     <meta name="theme-color" content="#2e84bf">
     <meta prefix="og: http://ogp.me/ns#" property="og:image" content="https://tachiyomi.org/icons/logo.png">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
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     <div id="app"></div>
-    <script src="/assets/js/app.5220e68f.js" defer></script><script src="/assets/js/27.1af89b9f.js" defer></script>
+    <script src="/assets/js/app.a5ded1d0.js" defer></script><script src="/assets/js/27.1af89b9f.js" defer></script>
   </body>
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