Add random query string (#1240)

We need this to avoid a locally cached 301 response redirecting to elastic.co/docs

I used ?lang=en so it does not look totally random like ?xyz

Author: reakaleek

src/Elastic.Markdown/Slices/Layout/_LandingPage.cshtml

@@ -252,7 +252,7 @@
 					<h3 class="font-sans font-bold text-2xl">Previous versions</h3>
 					<p class="grow mt-4">Browse the docs for previous Elastic product versions.</p>
 					<div class="mt-6">
-						<a href="https://www.elastic.co/guide" target="_blank" rel="noopener noreferrer" class="link text-white">
+						<a href="https://www.elastic.co/guide?lang=en" target="_blank" rel="noopener noreferrer" class="link text-white">
 							View previous versions
 							<svg class="link-arrow"
 							     xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor">