add LPW information to banner

PTS is now over and LPW is looking for attendees and sponsors after a
five year break. w/r/t d34b6a9

tweak the background colour to distinguish between this and previous one

Author: leejo

root/base.tx

@@ -124,11 +124,13 @@
             </ul>
         </nav>
         <div class="page-content [% block page_content_class -> { } %]">
-          <!--
           <div class="top-notify-banner">
             <i class="fas fa-info-circle"></i>
+              The London Perl and Raku Workshop takes place on 26th Oct 2024. If
+              your company depends on Perl, <a
+                target="_blank"
+                href="https://act.yapc.eu/lpw2024/">please consider sponsoring and/or attending</a>.
           </div>
-          -->
           <nav class="sidebar">
             %%  block left_nav -> {
             <div class="slidepanel">

root/static/less/nav.less

@@ -9,7 +9,7 @@
 }
 
 .top-notify-banner {
-  background-color: #2e3a47;
+  background-color: #006081;
   color: #fff;
   display: flex;
   flex-wrap: wrap;