docs: reorganize tools automation nav (#80116)

* docs: reorganize tools automation nav

* docs: add nav spec glossary terms

* docs: refresh nav spec validation

* docs: keep capabilities nav grouped

* docs: refactor tools overview

* docs: restore tools overview coverage

* add doc refactor skill

* docs: mark refactored docs schema

* docs: remove refactor specs from pr

* docs: rename tools overview header

docs/docs.json

@@ -1179,7 +1179,7 @@
             ]
           },
           {
-            "tab": "Tools & Plugins",
+            "tab": "Capabilities",
             "groups": [
               {
                 "group": "Overview",
@@ -1250,7 +1250,7 @@
                 ]
               },
               {
-                "group": "Automation and tasks",
+                "group": "Automation",
                 "pages": [
                   "automation/index",
                   "automation/cron-jobs",