feat: add note to home about transition to 1.0

Author: oddgrd

_layouts/home.html

@@ -13,8 +13,13 @@ <h1 class="hyper-logo">hyper</h1>
       </div>
     </section>
     <section class="container">
-    <div class="row">
-      <div class="col-md-6">
+      <div class="row">
+        <div class="col-md-6">
+        <p class="lead">
+          <b>Note:</b> hyper is planning a stable <code>1.0</code> release at the end of January 2023.
+          These guides will be gradually transitioned to <code>1.0</code>, but if you're looking for
+          guides for <code>0.14</code> you can find them <a href="/legacy">here</a>.
+        </p>
         <p class="lead">hyper is a fast HTTP implementation written in and for Rust.</p>
         <ul>
             <li>A <strong>Client</strong> for talking to web services.</li>