docs: add readme to storybook

Author: tmkx

.storybook/main.ts

@@ -25,6 +25,11 @@ const config: StorybookConfig = {
               '@fanciers/echarts-react': path.resolve(__dirname, '../src'),
             },
           },
+          module: {
+            rules: [
+              { test: /\.md$/, use: '@storybook/addon-docs/mdx-loader' }, //
+            ],
+          },
         },
       },
     });

.storybook/preview.tsx

@@ -16,7 +16,7 @@ const preview: Preview = {
     },
     options: {
       storySort: {
-        order: ['Line', 'Bar'],
+        order: ['README', 'Line', 'Bar'],
       },
     },
   } satisfies (CoreTypes & DocsTypes)['parameters'],

stories/README.mdx

@@ -0,0 +1 @@
+../README.md