docs: 💄 update docs ui

Signed-off-by: jffarge <jf@dagger.io>

website/src/theme/Navbar/styles.module.css

@@ -0,0 +1,20 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+@media screen and (max-width: 997px) {
+  .displayOnlyInLargeViewport {
+    display: none !important;
+  }
+}
+
+.navbarHideable {
+  transition: transform var(--ifm-transition-fast) ease;
+}
+
+.navbarHidden {
+  transform: translate3d(0, calc(-100% - 2px), 0);
+}