Add comments, Load default SEO config

pages/_app.js

@@ -1,10 +1,18 @@
+// Tailwind CSS
 import 'tailwindcss/tailwind.css';
-import { ThemeProvider } from "next-themes";
 import "../styles/globals.css"
 
+// Dark-mode related
+import { ThemeProvider } from "next-themes";
+
+// next-seo
+import { DefaultSeo } from 'next-seo';
+import SEO from '../next-seo.config';
+
 function MyApp({ Component, pageProps }) {
   return (
     <ThemeProvider attribute="class">
+      <DefaultSeo {...SEO} />
       <Component {...pageProps} />
     </ThemeProvider>
   );