Format markdown files

prettier.config.mjs

@@ -2,7 +2,16 @@ const config = {
   bracketSpacing: false,
   endOfLine: 'lf',
   singleQuote: true,
+  printWidth: 80,
   plugins: ['prettier-plugin-organize-imports'],
+  overrides: [
+    {
+      files: '*.md',
+      options: {
+        proseWrap: 'always',
+      },
+    },
+  ],
 };
 
 export default config;