re-implemented rendering of document

frontend/src/routes/document/View.svelte

@@ -81,12 +81,7 @@
 
     async function render(){
         const url = `${location.protocol}//${location.host.replace('5173','8080')}/api/document/${doc.id}/pdf`;
-        const resp = fetch(url,{credentials:'include'});
-        if (resp.ok){
-            error = null;
-        } else {
-            error = await resp.text();
-        }
+        location.href = url;
     }
 
     onMount(loadDoc);