Revert "Add ETHGlobal Hackathon banner (#440)"

This reverts commit 7d4ab1d.

docusaurus.config.js

@@ -57,12 +57,6 @@ const darkCodeTheme = require("prism-react-renderer/themes/dracula");
             position: 'right',
           },
         ],
-      },
-      announcementBar: {
-        id: "ETHGlobal",
-        content:
-          '<span>🍎</span><a href="https://collective.flashbots.net/t/ethglobal-ny-hackathon-sept-22-24/2413" target="_blank" rel="noreferrer">Participate in the Flashbots hackathon track at ETHGlobal NY, Sept 22 - 24</a><span>🍎</span>',
-        isCloseable: false,
       }
 
     }),

src/scss/custom.scss

@@ -114,45 +114,4 @@ h2 {
   &:hover {
     background-image: linear-gradient(transparent, rgba(0, 0, 0, .05) 40%, rgba(0, 0, 0, .1));
   }
-}
-
-/* Top banner */
-div[role=banner] { 
-  min-height: 32px;
-
-  > div {
-    min-height: 32px;
-    padding: 0px;
-    border: 0px;
-    display: flex;
-    align-items: center;
-    justify-content: center;
-    column-gap: 10px;
-    background-color: #f1be47;
-    color: #000000;
-    text-align: center;
-    font-size: 100%;
-
-    a {
-      font-family: "CMU-Serif";
-      font-size: 16px;
-      text-decoration: none;
-
-      &:hover {
-        text-decoration: underline;
-      }
-    }
-  }
-}
-
-@media (min-width: 341px) and (max-width: 640px) {
-  div[role=banner] > div a {
-    flex-basis: 280px;
-  }
-}
-
-@media (max-width: 340px) {
-  div[role=banner] > div a {
-    flex-basis: 150px;
-  }
-}
+}