Use PROD url for metas instead of host

src/routes/subscribe.svelte

@@ -34,7 +34,7 @@
 	<title>{pageTitle}</title>
     <meta name="description" content={$site.subscribe_text}>
     <SocialMetas
-        url="https://{$page.host}{$page.path}"
+        url="{process.env.CONFIG.PROD_URL}{$page.path}"
         title="{pageTitle}"
         description={$site.subscribe_text}
         image={$site.seo_share_image.full_url}