Add v12 release banner

Author: fhammerschmidt

src/Path.res

@@ -155,6 +155,7 @@ type t = [
   | #"/blog/release-8-4"
   | #"/blog/release-8-3"
   | #"/blog/release-8-3-2"
+  | #"/blog/release-12-0-0"
   | #"/blog/release-11-1-0"
   | #"/blog/release-11-0-0"
   | #"/blog/release-10-1"

src/layouts/LandingPageLayout.res

@@ -689,6 +689,13 @@ let make = (~components=MarkdownComponents.default, ~children) => {
     <div className="mt-4 xs:mt-16">
       <div className="text-gray-80 text-18 z">
         <div className="absolute w-full top-16">
+          <Banner>
+            {React.string("ReScript 12 is out! Read the ")}
+            <ReactRouter.Link to=#"/blog/release-12-0-0" className="underline">
+              {React.string("announcement blog post")}
+            </ReactRouter.Link>
+            {React.string(".")}
+          </Banner>
           <div className="relative overflow-hidden pb-32">
             <main className="mt-10 min-w-320 lg:align-center w-full">
               <div className="">