Fix some performance issues

* Remove render blocking stripe JS that seems unnecessary
* Use native lazy loading of images
  - Truly a progressive enhancement, only affects browsers that support it
  - Causes a warning: [Intervention] An <img> element was lazyloaded with loading=lazy, but had no dimensions specified. Specifying dimensions improves performance. See https://crbug.com/954323, which can not be easily fixed
* Render content first, hydrate after that

pages/_document.tsx

@@ -34,11 +34,11 @@ class MyDocument extends Document {
           <div className="site">
             <div className="container">
               <Main />
-              <NextScript />
             </div>
             <Footer />
           </div>
           <Fader />
+          <NextScript />
         </body>
       </Html>
     );