microsite: add Banner component + k8s launch banner

microsite/static/css/custom.css

@@ -1035,6 +1035,55 @@ code {
   }
 }
 
+.Banner {
+  position: relative;
+  padding: 14px;
+  margin: 14px 20px;
+  border-radius: 4px;
+  background-color: $primaryColor;
+  font-family: Helvetica Neue, sans-serif;
+  color: #000;
+}
+
+.Banner--hidden {
+  opacity: 0;
+  transition: opacity 200ms ease-in-out;
+}
+
+.Banner a {
+  color: #000;
+  text-decoration: underline;
+}
+
+.Banner__Container {
+  position: relative;
+  overflow: visible;
+  z-index: 100;
+
+  max-width: 1430px;
+  height: 0;
+  margin: -14px auto 14px auto;
+}
+
+.Banner__DismissButton {
+  position: absolute;
+  display: flex;
+  right: 8px;
+  top: 0;
+  bottom: 0;
+  margin: auto;
+
+  border-radius: 50%;
+  padding: 6px;
+  width: 36px;
+  height: 36px;
+  cursor: pointer;
+}
+
+.Banner__DismissButton:hover {
+  background: rgba(0, 0, 0, 0.2);
+}
+
 .logos-mobile-background {
   position: absolute;
   width: 200vw;

microsite/static/js/dismissable-banner.js

@@ -0,0 +1,18 @@
+window.addEventListener('DOMContentLoaded', () => {
+  const banners = document.querySelectorAll('[data-banner]');
+  banners.forEach(banner => {
+    const storageKey = `hideBanner/${banner.getAttribute('data-banner')}`;
+
+    if (!localStorage.getItem(storageKey)) {
+      banner.classList.remove('Banner--hidden');
+    }
+
+    const dismissButton = banner.querySelector('[data-banner-dismiss]');
+    if (dismissButton) {
+      dismissButton.addEventListener('click', () => {
+        banner.classList.add('Banner--hidden');
+        localStorage.setItem(storageKey, 'true');
+      });
+    }
+  });
+});