minor improvements:

- page titles
- favicon
- background logo

frontend/src/routes/search/Search.svelte

@@ -76,9 +76,12 @@
     }
 
     $effect(() => doSearch(key))
-
 </script>
 
+<svelte:head>
+    <title>Umbrella – {t('search')}: {key}</title>
+</svelte:head>
+
 <fieldset class="search">
     <legend>{t('search')}</legend>
     {#if error}