API routes now return proper Responses and basic errors are handled

slight improvements in layouting

src/routes/rezepte/add/+page.svelte

@@ -126,7 +126,17 @@
 				bearer: password,
      				}
 			})
-		})
+		});
+		if(res.status === 200){
+			const url = location.href.split('/')
+			url.splice(url.length -1, 1);
+			url.push(short_name)
+			location.assign(url.join('/'))
+		}
+		else{
+			const item = await res.json();
+			alert(item.message)
+		}
 
 	}