fix: add redirects for old /docs/basics/concepts paths (#852)

Add Docusaurus client-side redirects for concept pages moved from
/docs/basics/concepts/* to /docs/ckb-fundamentals/* during the docs
restructure. The reported 404s include /docs/basics/concepts/ckb-vm;
this covers all concept pages from the old path.

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

Author: humble-little-bear

website/docusaurus.config.js

@@ -172,6 +172,26 @@ const config = {
             from: "/docs/basics/concepts/economics",
             to: "/docs/assets-token-standards/economics",
           },
+          {
+            from: "/docs/basics/concepts/cell-model",
+            to: "/docs/ckb-fundamentals/cell-model",
+          },
+          {
+            from: "/docs/basics/concepts/ckb-vm",
+            to: "/docs/ckb-fundamentals/ckb-vm",
+          },
+          {
+            from: "/docs/basics/concepts/consensus",
+            to: "/docs/ckb-fundamentals/consensus",
+          },
+          {
+            from: "/docs/basics/concepts/cryptowallet",
+            to: "/docs/integrate-wallets/intro-to-wallets",
+          },
+          {
+            from: "/docs/basics/concepts/nervos-blockchain",
+            to: "/docs/ckb-fundamentals/nervos-blockchain",
+          },
           {
             from: "/docs/basics/glossary/",
             to: "/docs/tech-explanation/glossary",