fix: improve sidebar UI (#5453)

* fix: revert dark main color

* fix: workspace name font size

* fix: only show collapse button when hovering the sidebar

* fix: remove expand button after workspace name

* fix: change settings icon opactiy to 0.7

* chore: replace favorite icon

* chore: add arrow icon after section name

* chore: replace trash bin icon

* chore: adjust collapse icon padding

* feat: redesign question bubble

* fix: replace favorite icon

* fix: remove trash button padding

* chore: replace hover color

* feat: add more padding to tooltip

* feat: add hover effect to arrow icon

* feat: add hover effect to add view button

* fix: view title color

* feat: replace question bubble

* feat: replace default page icon

* fix: header icon size

* fix: add view button padding

* fix: unable to insert default image on desktop

* fix: notification button size issue

* fix: workspace icon size

* feat: add a divider between favorite space and add new page button

frontend/appflowy_flutter/lib/plugins/document/document.dart

@@ -37,7 +37,7 @@ class DocumentPluginBuilder extends PluginBuilder {
   String get menuName => LocaleKeys.document_menuName.tr();
 
   @override
-  FlowySvgData get icon => FlowySvgs.document_s;
+  FlowySvgData get icon => FlowySvgs.icon_document_s;
 
   @override
   PluginType get pluginType => PluginType.document;
@@ -148,7 +148,7 @@ class DocumentPluginWidgetBuilder extends PluginWidgetBuilder
               ? [
                   DocumentCollaborators(
                     key: ValueKey('collaborators_${view.id}'),
-                    width: 150,
+                    width: 120,
                     height: 32,
                     view: view,
                   ),