docs: place maturity pages under release reference (#96061)

Merged via squash.

Prepared head SHA: 7ab898262e
Co-authored-by: vincentkoc <25068+vincentkoc@users.noreply.github.com>
Co-authored-by: vincentkoc <25068+vincentkoc@users.noreply.github.com>
Reviewed-by: @vincentkoc

docs/docs.json

@@ -68,6 +68,14 @@
       "source": "/reference/openclaw-sdk-api-design",
       "destination": "/gateway/external-apps"
     },
+    {
+      "source": "/reference/maturity-scorecard",
+      "destination": "/maturity/scorecard"
+    },
+    {
+      "source": "/reference/maturity-taxonomy",
+      "destination": "/maturity/taxonomy"
+    },
     {
       "source": "/mcp",
       "destination": "/cli/mcp"
@@ -1654,15 +1662,6 @@
               }
             ]
           },
-          {
-            "tab": "Maturity",
-            "groups": [
-              {
-                "group": "Maturity docs",
-                "pages": ["maturity/scorecard", "maturity/taxonomy"]
-              }
-            ]
-          },
           {
             "tab": "Reference",
             "groups": [
@@ -1861,6 +1860,8 @@
               {
                 "group": "Release and CI",
                 "pages": [
+                  "maturity/scorecard",
+                  "maturity/taxonomy",
                   "reference/RELEASING",
                   "reference/full-release-validation",
                   "reference/release-performance-sweep",