minor improvements:

- page titles
- favicon
- background logo

frontend/src/routes/task/View.svelte

@@ -170,6 +170,10 @@
     }
 </script>
 
+<svelte:head>
+    <title>Umbrella – {t('task')}: {task?.name}</title>
+</svelte:head>
+
 {#if error}
 <span class="error">{error}</span>
 {/if}