[Site] Fix LiveMemory components

Author: smnandre

ux.symfony.com/assets/styles/components/_Banner.scss

@@ -13,6 +13,11 @@
   display: none;
 }
 
+.Banner .container-xxl {
+  max-width: 1320px;
+  margin: 0 auto;
+}
+
 .BannerInner {
   display: flex;
   flex-direction: column;

ux.symfony.com/assets/styles/demos/live-memory.min.css

@@ -1,10 +1,15 @@
 /** -----------------------------------------------------------------
  * LiveMemory demo
+ *
+ * This file is suffixed with `.min.css` to prevent it from being
+ * processed by the CDN compression system, which would break the
+ * most recent CSS syntax (as layers) used in this file.
  * --------------------------------------------------------------- */
 
 @import "live-memory/app/reset";
 @import "live-memory/app/root";
 
+@import "../components/Banner";
 @import "../components/Icon";
 
 @import "live-memory/components/Board";