feat(WEB-93): add Header to CMS and render it in Next

lib/graphql/Query/Header.graphql

@@ -0,0 +1,32 @@
+#import "../Fragments/Image.graphql"
+
+query GetHeader($locale: String!) {
+  all_header(limit: 1, locale: $locale) {
+    items {
+      frontpage_link_text
+      logoConnection {
+        edges {
+          node {
+            ...Image
+          }
+        }
+      }
+      menu {
+        links {
+          href
+          title
+        }
+      }
+      top_menu {
+        links {
+          link {
+            href
+            title
+          }
+          show_on_mobile
+          sort_order_mobile
+        }
+      }
+    }
+  }
+}