Revert "fun with banner (halloween)"

This reverts commit a61c29b.

_layouts/chapter.html

@@ -4,20 +4,14 @@
 
   <!-- Announcement we can keep for 1 month or more. I remove it and re-add it from time to time. -->
 
-<p class="announce" style="background-color: black">
-  <a style="font-size: 120%; color: darkgrey"
-      href="https://www.udemy.com/course/common-lisp-programming/?couponCode=LISP-IS-NOT-DEAD"
-      title="Learn Lisp efficiently with a code-first approach. Getting started, CLOS, macros… 7 hours of content, and counting. This course is on the Udemy platform. Each chapter has free videos so you can judge before diving in. vindarel is (I am) the main contributor of this Cookbook. I teach what I learned the hard way.">
-
-    <img src="https://media.gettyimages.com/id/157505949/photo/a-scary-halloween-pumpkin-in-smoke.jpg?s=612x612&w=0&k=20&c=jlscQmDkLVQRW55tAaP8_Pqu5FGOsC5ZMv_2IsfA6g4= "
-        style="max-height: 60px; padding: 3px; transform: rotateY(180deg);"/>Common Lisp is not dead. Fear it!
-
-  </a>
-
-  <!--  <strong>
+<p class="announce">
+  📢 👩‍🎓 ⭐
+  <a style="font-size: 120%" href="https://www.udemy.com/course/common-lisp-programming/?couponCode=LISP-IS-NOT-DEAD"
+      title="Learn Lisp efficiently with a code-first approach. Getting started, CLOS, macros… 7 hours of content, and counting. This course is on the Udemy platform. Each chapter has free videos so you can judge before diving in. vindarel is (I am) the main contributor of this Cookbook. I teach what I learned the hard way. Your support makes a difference for me.">NEW: learn CLOS in videos! (50% coupon)</a>, by the Cookbook's main contributor.
+  <!-- <strong>
        Get up to speed in CL in this 7h course, by the Cookbook's main contributor, on Udemy.
        </strong> -->
-  <a style="font-size: 90%; color: grey" href="https://github.com/vindarel/common-lisp-course-in-videos/">Learn more</a>.
+  <a style="font-size: 90%" href="https://github.com/vindarel/common-lisp-course-in-videos/">Learn more</a>.
 </p>