Add "Contact us" link to header and update hero section text

Author: mewim

src/lib/components/layout/Header.svelte

@@ -57,6 +57,11 @@
 			<div
 				class="hidden md:flex items-center gap-6 flex-grow justify-end"
 			>
+				<a
+					href="mailto:contact@kuzudb.com"
+					rel="noopener noreferrer"
+					class="hover:text-primary transition-colors">Contact us</a
+				>
 				<a
 					href="https://demo.kuzudb.com"
 					target="_blank"

src/lib/components/sections/Hero.svelte

@@ -143,7 +143,7 @@
 		<p
 			class="text-xl md:text-2xl text-muted-foreground mb-8 max-w-2xl mx-auto"
 		>
-			Kuzu is the simplest way to manage knowledge graphs and vectors.
+			The easiest way to manage knowledge graphs and vectors.
 		</p>
 		<div class="flex gap-4 justify-center mb-8">
 			<a href="//github.com/kuzudb/kuzu">