switch to nextra

next.config.js

@@ -0,0 +1,11 @@
+const withNextra = require('nextra')({
+  theme: 'nextra-theme-docs',
+  themeConfig: './theme.config.jsx',
+})
+
+module.exports = {
+  ...withNextra(),
+  images: {
+    unoptimized: true,
+  },
+}