feat: add initial my pages navigation

lib/graphql/Query/NavigationMyPages.graphql

@@ -0,0 +1,29 @@
+query GetNavigationMyPages {
+  all_navigation_my_pages {
+    items {
+      items {
+        ... on NavigationMyPagesItemsItem {
+          __typename
+          item {
+            pageConnection {
+              edges {
+                node {
+                  ... on CodeDefinedPage {
+                    title
+                  }
+                  ... on ContentPage {
+                    title
+                  }
+                }
+              }
+            }
+            link_text
+          }
+        }
+      }
+      system {
+        uid
+      }
+    }
+  }
+}