[DOCS] Update navbar and sidebar tyle (#1865)

Apply only to the upload page and add navbar

docs/.vuepress/styles/index.styl

@@ -1,4 +1,3 @@
-// index.styl
 div.table-generated-page
   main
     div.content__default,
@@ -7,5 +6,8 @@ div.table-generated-page
       // Display full with the API pages
       max-width: 65%
 
-.sidebar
+  .sidebar
+    z-index 6
+
+  .navbar
     z-index 6