archive-notice: fix colours; improve text

Author: ES-Alexander

archive-notice.html

@@ -1,8 +1,8 @@
-<div style="position:fixed;margin-top:-50px;background-color:rgb(252, 248, 227);padding:10px;width:100%;max-width:770px;">
-  <h2 style="margin-top:5px;margin-bottom:5px;">⚠️  ARCHIVE NOTICE ⚠️  </h2>
-  <h3 style="margin-top:0px;margin-bottom:5px;">This documentation is no longer being maintained!</h3>
+<div style="position:fixed;margin-top:-50px;background-color:rgb(252, 248, 227);color:black;padding:10px;border-radius:5px;width:100%;max-width:770px;">
+  <h2 style="margin-top:5px;margin-bottom:5px;color:black;">⚠️  ARCHIVE NOTICE ⚠️  </h2>
+  <h3 style="margin-top:0px;margin-bottom:5px;color:black;">This documentation is no longer being maintained!</h3>
   <ul>
-    <li>The new ArduSub docs are located in the <a href="https://ardupilot.org/sub/">ArduPilot wiki</a>.</li>
+    <li>The new ArduSub docs are located in the <a href="https://ardupilot.org/sub/">ArduPilot wiki</a>. Updated pages will be redirected.</li>
     <li>The Companion Computer Software is also archived, and has been replaced by <a href="https://blueos.cloud/">BlueOS</a>.</li>
     <li>For Control Station Software, see <a href="https://docs.qgroundcontrol.com/Stable_V4.3/en/qgc-user-guide/">QGroundControl</a> or <a href="https://blueos.cloud/cockpit/docs">Cockpit</a> (our new alternative).</li>
   </ul>