fix: <StoryDescription> make className and headerStyle props not requ…

…ired (#128)

src/components/story-description/story-description.tsx

@@ -1,18 +1,18 @@
-import { FC, useMemo } from 'react';
+import React, { FC, useMemo } from 'react';
 import cx from 'classnames';
-import styles from './story-description.module.scss';
 import { ElementContent, withStaticProps } from '../../types';
 import { FlexAlign, FlexDirection, FlexGap, FlexJustify } from '../../helpers/components/Flex/FlexConstants';
 import Flex from '../../helpers/components/Flex/Flex';
+import styles from './story-description.module.scss';
 
 type StoryDescriptionProps = {
   align?: FlexAlign;
   description?: ElementContent;
   children: ElementContent;
-  className: string;
+  className?: string;
   headerAlign?: FlexAlign;
   headerJustify?: FlexJustify;
-  headerStyle: React.CSSProperties;
+  headerStyle?: React.CSSProperties;
   justify?: FlexJustify;
   vertical?: boolean;
 };