Migrate from github to gitea + some improvements

frontend/src/app/Services/auth.service.ts

@@ -1,7 +1,7 @@
 import { Injectable } from '@angular/core';
 import { HttpClient, HttpHeaders } from '@angular/common/http';
 import { Observable } from 'rxjs';
-const AUTH_API = 'https://gruppe1.testsites.info/api/user';
+const AUTH_API = '/api/user';
 
 const httpOptions = {
   headers: new HttpHeaders({ 'Content-Type': 'application/json' }),

frontend/src/app/Services/bot.service.ts

@@ -3,7 +3,7 @@ import { Injectable } from '@angular/core';
 import { Observable } from 'rxjs';
 import { TokenStorageService } from './token.service';
 
-const API_URL = 'https://gruppe1.testsites.info/api/';
+const API_URL = '/api/';
 
 @Injectable({
   providedIn: 'root',

frontend/src/app/Services/data.service.ts

@@ -2,7 +2,7 @@ import { Injectable, OnInit } from '@angular/core';
 import { HttpClient, HttpHeaders } from '@angular/common/http';
 import { delay, Observable } from 'rxjs';
 import { TokenStorageService } from './token.service';
-const API_URL = 'https://gruppe1.testsites.info/api/';
+const API_URL = '/api/';
 @Injectable({
   providedIn: 'root',
 })

frontend/src/app/Services/profile.service.ts

@@ -3,7 +3,7 @@ import { Injectable } from '@angular/core';
 import { Observable } from 'rxjs';
 import { TokenStorageService } from './token.service';
 
-const API_URL = 'https://gruppe1.testsites.info/api/';
+const API_URL = '/api/';
 
 @Injectable({
   providedIn: 'root',
@@ -77,7 +77,7 @@ export class ProfileService {
    */
   public addCronString(cron: string): Observable<any> {
     return this.http.put(
-      'https://gruppe1.testsites.info/api/user' + '/setCron',
+      '/api/user' + '/setCron',
       {
         cron,
       },