Side bar update for subset design

docs/.vitepress/config/en.ts

@@ -263,9 +263,13 @@ function sidebarGuidelines(): DefaultTheme.SidebarItem[] {
           link: "/guidelines/content/achievements-for-rom-hacks",
         },
         {
-          text: "Subsets",
+          text: "Multiset and Subset Types",
           link: "/guidelines/content/subsets",
         },
+        {
+          text: "Subset Design",
+          link: "/guidelines/content/subset_design",
+        },
         {
           text: "Working with the Right ROM",
           link: "/guidelines/content/working-with-the-right-rom",