fix: add navigation subitems

lib/graphql/Query/NavigationMyPages.graphql

@@ -5,25 +5,45 @@ query GetNavigationMyPages {
         ... on NavigationMyPagesItemsItem {
           __typename
           item {
-            pageConnection {
-              edges {
-                node {
-                  ... on CodeDefinedPage {
-                    title
-                  }
-                  ... on ContentPage {
-                    title
+            link_text
+            sub_items {
+              ... on NavigationMyPagesItemsItemBlockSubItemsItem {
+                __typename
+                item {
+                  link_text
+                  pageConnection {
+                    edges {
+                      node {
+                        ... on CodeDefinedPage {
+                          title
+                          url
+                        }
+                        ... on ContentPage {
+                          title
+                        }
+                      }
+                    }
+                  }
+                }
+              }
+            }
+            pageConnection {
+              edges {
+                node {
+                  ... on ContentPage {
+                    title
+                  }
+                  ... on CodeDefinedPage {
+                    title
+                    url
                   }
                 }
               }
             }
-            link_text
           }
         }
       }
-      system {
-        uid
-      }
+      title
     }
   }
 }