added login and sign Funtion properly

server/api/signup.ts

@@ -1,16 +1,8 @@
-import { registeringSuccessful, errorMsg } from "../middleware/signUp.js";
-import { OutgoingMessage } from 'http';
+import { errorMsg } from "../middleware/signUp.js";
 
 export default defineEventHandler(async (event) => {
 
-    const headers: Record<string, Parameters<OutgoingMessage['setHeader']>[1]> = {
-        'Access-Control-Allow-Origin': 'https://tueitapp.tueit.de',
-        'Access-Control-Allow-Headers': 'authorization, content-type',
-        'Access-Control-Allow-Methods': 'GET,HEAD,PUT,PATCH,POST,DELETE',
-    };
-    setResponseHeaders(event, headers)
-
-    if (!registeringSuccessful) {
+    if (!(errorMsg === '')) {
         throw createError({
             statusCode: 400,
             statusMessage: errorMsg,