Remove Black Hat banner (#5672)

Author: kimsauce

docusaurus.config.js

@@ -251,12 +251,6 @@ module.exports = {
       { property: 'og:image:height', content: '628' },
       { property: 'og:image:alt', content: 'Sumo Logic Docs' },
     ],
-    announcementBar: {
-      id: 'blackhat',
-      content: 'Visit Sumo Logic at Black Hat USA in Las Vegas: August 6-7, 2025 | Mandalay Bay | Booth #5812 | <a target="_blank" rel="noopener noreferrer" href="https://www.sumologic.com/events/black-hat-book-meeting">Click here</a> to book a meeting with us!',
-      backgroundColor: '#b0eefe',
-      textColor: '#091E42',
-    },
     imageZoom: {
       selector: '.markdown :not(a) > img',
       // Optional medium-zoom options