Enable React strict mode

web/next.config.js

@@ -2,6 +2,7 @@ const withLess = require('next-with-less');
 
 module.exports = withLess({
   trailingSlash: true,
+  reactStrictMode: true,
   webpack(config) {
     config.module.rules.push({
       test: /\.svg$/i,
@@ -9,11 +10,6 @@ module.exports = withLess({
       use: ['@svgr/webpack'],
     });
 
-    config.module.rules.push({
-      test: /\.html/,
-      type: 'asset/source',
-    });
-
     return config;
   },
   async rewrites() {