Lazy load offscreen image (#1543)

Author: reakaleek

src/Elastic.Documentation.Site/Layout/_Footer.cshtml

@@ -4,7 +4,7 @@
 	<div class="max-w-(--max-layout-width) w-full mx-auto">
 	<div class="text-grey-20 text-[12px]">
 		<a href="https://www.elastic.co/">
-			<img class="block" alt="Elastic logo" src="@Model.Static("logo-elastic-horizontal-white.svg")" width="120" height="41"/>
+			<img class="block" loading="lazy" alt="Elastic logo" src="@Model.Static("logo-elastic-horizontal-white.svg")" width="120" height="41"/>
 		</a>
 	</div>
 	<div class="text-grey-20 text-[12px] bg-ink-dark grid grid-cols-1 md:grid-cols-2 gap-2 items-center">