[Toolkit] Remove "Grid" component

See symfony#2539 (comment)

Author: Kocal

src/Toolkit/registry/default/components/Grid.json

@@ -183,32 +183,6 @@
             "dependencies": [],
             "parentName": "Card"
         },
-        {
-            "name": "Grid",
-            "manifest": "components/Grid.json",
-            "theme": "",
-            "type": "component",
-            "dependencies": [
-                "Col",
-                "Row"
-            ]
-        },
-        {
-            "name": "Col",
-            "manifest": "components/Grid/Col.json",
-            "theme": "",
-            "type": "component",
-            "dependencies": [],
-            "parentName": "Grid"
-        },
-        {
-            "name": "Row",
-            "manifest": "components/Grid/Row.json",
-            "theme": "",
-            "type": "component",
-            "dependencies": [],
-            "parentName": "Grid"
-        },
         {
             "name": "Navbar",
             "manifest": "components/Navbar.json",
@@ -359,14 +333,6 @@
             "dependencies": [],
             "parentName": "Card"
         },
-        {
-            "name": "GridDefault",
-            "manifest": "examples/Grid/GridDefault.json",
-            "theme": "",
-            "type": "example",
-            "dependencies": [],
-            "parentName": "Grid"
-        },
         {
             "name": "TableDefault",
             "manifest": "examples/Table/TableDefault.json",