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;