Change item list URL to /user/:userId/lists

This is because it's the terminology I'm using elsewhere ("Items" and "Closet" are too overloaded in the UI), and because I want to start putting specific lists at like `/user/:userId/lists/:listId`!

I also create a redirect from the old URL, and also from the DTI Classic variant of the URL

src/app/App.js

@@ -135,7 +135,7 @@ function App() {
               <Route path="/outfits/:id">
                 <WardrobePage />
               </Route>
-              <Route path="/user/:userId/items">
+              <Route path="/user/:userId/lists">
                 <PageLayout>
                   <UserItemsPage />
                 </PageLayout>

vercel.json

@@ -1,5 +1,10 @@
 {
   "routes": [
+    {
+      "src": "/user/(?<userId>[^/]+)/(closet|items)",
+      "status": 308,
+      "headers": { "Location": "/user/$userId/lists" }
+    },
     {
       "src": "/outfits/(?<id>[^/]+)/(?<size>150|300|600)\\.png",
       "dest": "/api/outfitImage.js?size=$size&id=$id"