chore: config plugin display

frontend/app_flowy/lib/workspace/presentation/home/home_stack.dart

@@ -168,7 +168,7 @@ class HomeStackManager {
           index: getIt<PluginSandbox>().indexOf(notifier.plugin.ty),
           children: getIt<PluginSandbox>().supportPluginTypes.map((pluginType) {
             if (pluginType == notifier.plugin.ty) {
-              return notifier.plugin.display.buildWidget();
+              return notifier.plugin.display.buildWidget().padding(horizontal: 40, vertical: 28);
             } else {
               return const BlankPage();
             }

frontend/app_flowy/lib/workspace/presentation/plugins/doc/src/document_page.dart

@@ -10,7 +10,6 @@ import 'package:flowy_sdk/protobuf/flowy-folder-data-model/view.pb.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:provider/provider.dart';
-import 'package:styled_widget/styled_widget.dart';
 import 'styles.dart';
 import 'widget/banner.dart';
 
@@ -82,7 +81,7 @@ class _DocumentPageState extends State<DocumentPage> {
               _renderToolbar(controller),
               const VSpace(10),
             ],
-          ).padding(horizontal: 40, top: 28),
+          ),
         ),
       ],
     );

frontend/app_flowy/lib/workspace/presentation/plugins/grid/grid.dart

@@ -28,7 +28,7 @@ class GridPluginBuilder implements PluginBuilder {
 
 class GridPluginConfig implements PluginConfig {
   @override
-  bool get creatable => false;
+  bool get creatable => true;
 }
 
 class GridPlugin extends Plugin {

frontend/app_flowy/lib/workspace/presentation/plugins/grid/src/layout/sizes.dart

@@ -10,7 +10,7 @@ class GridSize {
 
   static double get scrollBarSize => 12 * scale;
   static double get headerHeight => 50 * scale;
-  static double get rowHeight => 50 * scale;
+  static double get rowHeight => 36 * scale;
   static double get footerHeight => 40 * scale;
   static double get firstHeaderPadding => 20 * scale;
 }