aufräumen

src/components/Event.tsx

 import React from 'react';
 import Card from './Card';
-import { joinClassNames } from './classNames';
+import { joinClassNames } from '../utils/classNames';
 
 
 interface EventProps{

src/components/ImageEvent.tsx

 import React from 'react';
 import Event from './Event';
-import { joinClassNames } from './classNames';
+import { joinClassNames } from '../utils/classNames';
 
 
 export function ImageAtom({ src, alt }:{src: string, alt: string}) {