docs: flip ownership of View/SQL-client/FTS-SQL/AuthZ/AuthN to OSS, restructure SQL Reference

OSS docs now own the full usage content for features that only run against
an Enterprise deployment, since the client interface itself lives here;
Enterprise docs keep only the parts specific to its own behavior. Sophon's
overlay for these five pages is dropped since the OSS versions are now the
complete reference.

SQL Reference is restructured to match an object-type SQL manual (DDL by
object, then DML, then DQL, then Expressions) instead of the old flat,
loosely-ordered page list, absorbing the SQL client-connection guide and
FTS-via-SQL examples into it.

docs/web/docs.json

@@ -162,6 +162,58 @@
     {
       "source": "/enterprise/deployment",
       "destination": "/enterprise/deployment/index"
+    },
+    {
+      "source": "/search/sql/index",
+      "destination": "/sql"
+    },
+    {
+      "source": "/search/sql/fts-sql",
+      "destination": "/sql/dql/fts"
+    },
+    {
+      "source": "/sql/select",
+      "destination": "/sql/dql/select"
+    },
+    {
+      "source": "/sql/subqueries",
+      "destination": "/sql/dql/subqueries"
+    },
+    {
+      "source": "/sql/join",
+      "destination": "/sql/dql/join"
+    },
+    {
+      "source": "/sql/aggregation",
+      "destination": "/sql/dql/aggregation"
+    },
+    {
+      "source": "/sql/window",
+      "destination": "/sql/dql/window"
+    },
+    {
+      "source": "/sql/sampling",
+      "destination": "/sql/dql/sampling"
+    },
+    {
+      "source": "/sql/explain",
+      "destination": "/sql/dql/explain"
+    },
+    {
+      "source": "/sql/ddl",
+      "destination": "/sql/ddl/table"
+    },
+    {
+      "source": "/sql/dml",
+      "destination": "/sql/dml/insert"
+    },
+    {
+      "source": "/sql/refresh",
+      "destination": "/sql/dml/refresh"
+    },
+    {
+      "source": "/sql/show",
+      "destination": "/sql/ddl/job"
     }
   ],
   "navigation": {
@@ -293,24 +345,51 @@
             "group": "SQL Reference",
             "pages": [
               "sql/index",
-              "search/sql/index",
               "sql/data-types",
-              "sql/select",
-              "search/sql/fts-sql",
-              "sql/subqueries",
-              "sql/join",
-              "sql/aggregation",
-              "sql/window",
-              "sql/sampling",
-              "sql/ddl",
-              "sql/dml",
-              "sql/refresh",
-              "sql/show",
-              "sql/explain",
-              "sql/prepared-statements",
-              "sql/operators",
-              "sql/functions",
-              "sql/scalar-functions"
+              {
+                "group": "DDL",
+                "pages": [
+                  "sql/ddl/namespace",
+                  "sql/ddl/table",
+                  "sql/ddl/view",
+                  "sql/ddl/materialized-view",
+                  "sql/ddl/index",
+                  "sql/ddl/function",
+                  "sql/ddl/job"
+                ]
+              },
+              {
+                "group": "DML",
+                "pages": [
+                  "sql/dml/insert",
+                  "sql/dml/update",
+                  "sql/dml/delete",
+                  "sql/dml/copy",
+                  "sql/dml/refresh"
+                ]
+              },
+              {
+                "group": "DQL",
+                "pages": [
+                  "sql/dql/select",
+                  "sql/dql/subqueries",
+                  "sql/dql/join",
+                  "sql/dql/aggregation",
+                  "sql/dql/window",
+                  "sql/dql/sampling",
+                  "sql/dql/fts",
+                  "sql/dql/explain"
+                ]
+              },
+              {
+                "group": "Expressions",
+                "pages": [
+                  "sql/operators",
+                  "sql/functions",
+                  "sql/scalar-functions",
+                  "sql/prepared-statements"
+                ]
+              }
             ]
           },
           {