added seeder for legacy apge and added the legacy page

apps/web/app/lib/route-slugs.ts

@@ -1,5 +1,5 @@
 /* ============================================================================
-   ROUTE SLUGS - the single source of truth for the site's ten sections
+   ROUTE SLUGS - the single source of truth for the site's eleven sections
    ----------------------------------------------------------------------------
    This module has ZERO imports on purpose: it is loaded by `app/routes.ts`,
    which the React Router dev plugin evaluates in Node while building the route
@@ -23,6 +23,7 @@
 export const ROUTE_SLUGS = {
   home: "",
   about: "about",
+  legacy: "legacy",
   whatWeDo: "what-we-do",
   activities: "activities-and-initiatives",
   events: "events-calendar",
@@ -41,7 +42,7 @@ export type RouteSlugKey = keyof typeof ROUTE_SLUGS;
  */
 export type RouteSlugs = typeof ROUTE_SLUGS;
 
-/** The ten section keys in navigation order. */
+/** The section keys in navigation order. */
 export const ROUTE_SLUG_KEYS = Object.keys(ROUTE_SLUGS) as readonly RouteSlugKey[];
 
 /**
@@ -57,7 +58,7 @@ export function sectionSlugPath(key: RouteSlugKey): string {
 export const ROUTE_SECTION_GROUPS = [
   {
     id: "about-and-strategy",
-    children: ["about", "whatWeDo", "activities"],
+    children: ["about", "legacy", "whatWeDo", "activities"],
   },
   {
     id: "engagement-and-opportunities",