Fixed one endpoint call to match ticket #60 dynamic changing host.

project/frontend/src/util/api.ts

@@ -113,7 +113,7 @@ export const fetchKennzahlen = async (): Promise<Kennzahl[]> => {
 };
 
 export async function fetchPitchBooks() {
-	const response = await fetch("http://localhost:5050/api/pitch_book/");
+	const response = await fetch(`${API_HOST}/api/pitch_book/`);
 	if (!response.ok) {
 		throw new Error("Failed to fetch pitch books");
 	}