fix(layout): avoid sidebar overflow beyond footer (#11621)

This issue affected Chrome, Edge, and Safari.

* style: change sidebar's position property on tablet

* Update client/src/document/organisms/sidebar/index.scss

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Co-authored-by: Claas Augner <495429+caugner@users.noreply.github.com>

client/src/document/organisms/sidebar/index.scss

@@ -254,6 +254,7 @@
   }
   @media (min-width: $screen-md) {
     display: flex;
+    position: relative;
   }
   @media (min-width: $screen-lg), (min-height: $screen-height-place-limit) {
     display: block;