Fix Deprecated Storybook Import Path (#242)

Description of changes

Fix deprecated scoped blocks import in Storybook introduction MDX file.

[Deprecation Reference](https://github.com/storybookjs/storybook/blob/next/MIGRATION.md#deprecated-scoped-blocks-imports)

docs/storybook/Introduction.stories.mdx

@@ -1,4 +1,4 @@
-import {Meta} from '@storybook/addon-docs/blocks';
+import {Meta} from '@storybook/addon-docs';
 
 <Meta title="Docs/Introduction" parameters={{options: {isToolshown: false}}} />