Fix guest social links hidden when Twitter is missing, fixes #2163 (#2164)

Author: 2u841r

src/routes/(site)/guest/[name_slug]/+page.svelte

@@ -12,7 +12,7 @@
 			<img src={`https://github.com/${guest.github}.png`} alt={guest.name} />
 			<div>
 				<h1>{guest.name}</h1>
-				{#if guest.twitter}
+				{#if guest.twitter || guest.github || guest.url}
 					<div class="guest_socials">
 						<HostSocialLink host={guest} />
 					</div>