fix(docs): fix vercel.json redirects that land on 404 (#5157)

- Redirect /docs/lucide-*, /guide/lucide-* and /guide/packages/lucide-*/ to
  the current /guide/<pkg> pages (vue-next -> vue)
- Redirect old /guide/basics/*, /guide/advanced/* and /guide/design/* pages
- Redirect graduated lab icons carton-off and briefcase-plus to core
- Remove the /docs/:slug(lucide-?.*) rule that produced 404 destinations

Fixes LUCIDE-15


Claude-Session: https://claude.ai/code/session_01G9u8FetMRtXGCVFrfg619a

Co-authored-by: Claude <noreply@anthropic.com>

docs/vercel.json

@@ -12,8 +12,68 @@
       "permanent": true
     },
     {
-      "source": "/docs/:slug(lucide-?.*)",
-      "destination": "/guide/:slug",
+      "source": "/docs/lucide-vue-next",
+      "destination": "/guide/vue",
+      "permanent": true
+    },
+    {
+      "source": "/guide/packages/lucide-vue-next",
+      "destination": "/guide/vue",
+      "permanent": true
+    },
+    {
+      "source": "/guide/vue-next",
+      "destination": "/guide/vue",
+      "permanent": true
+    },
+    {
+      "source": "/docs/lucide",
+      "destination": "/guide/lucide",
+      "permanent": true
+    },
+    {
+      "source": "/docs/lucide-:pkg",
+      "destination": "/guide/:pkg",
+      "permanent": true
+    },
+    {
+      "source": "/guide/lucide-:pkg",
+      "destination": "/guide/:pkg",
+      "permanent": true
+    },
+    {
+      "source": "/guide/packages/lucide-:pkg/",
+      "destination": "/guide/:pkg",
+      "permanent": true
+    },
+    {
+      "source": "/guide/advanced/accessibility",
+      "destination": "/how-to/accessibility",
+      "permanent": true
+    },
+    {
+      "source": "/guide/basics/:slug",
+      "destination": "/guide/react/basics/:slug",
+      "permanent": true
+    },
+    {
+      "source": "/guide/advanced/:slug",
+      "destination": "/guide/react/advanced/:slug",
+      "permanent": true
+    },
+    {
+      "source": "/guide/design/figma-guide",
+      "destination": "/contribute/icons/figma-guide",
+      "permanent": true
+    },
+    {
+      "source": "/guide/design/:slug(icon-design-guide|icon-properties)",
+      "destination": "/contribute/icons/design-principles",
+      "permanent": true
+    },
+    {
+      "source": "/icons/lab/:name(carton-off|briefcase-plus)",
+      "destination": "/icons/:name",
       "permanent": true
     },
     {
@@ -47,11 +107,6 @@
       "destination": "/how-to/accessibility",
       "permanent": true
     },
-    {
-      "source": "/guide/advanced/accessibility",
-      "destination": "/how-to/accessibility",
-      "permanent": true
-    },
     {
       "source": "/guide/advanced",
       "destination": "/guide/react/advanced",