Add timezone warning to top of +layout.svelte conditionally displayed when the users device is not in the Europe/London timezone

src/routes/+layout.svelte

@@ -6,6 +6,8 @@
 	import { LOCATIONS } from '$lib/locations-object.svelte';
 	import { nearestStationsState } from '$lib/geohash.svelte';
 
+	import TimezoneWarning from '$lib/components/ui/TimezoneWarning.svelte';
+
 	import '$lib/global.css';
 
 	import logoText from '$lib/assets/round-logo-text.svg';
@@ -78,6 +80,7 @@
 </header>
 
 <main>
+	<TimezoneWarning />
 	{@render children()}
 </main>