Page layout refactoring (#14535)

In this PR:
- Refactored the page layout renderer
- Converted all the states to component states
- Removed the page layout edition in settings

TODOs in next PRs:
- Fix bug with the drag selector not taking the scroll into account to
display the dragged area
- Readd the tab edition in edit mode

packages/twenty-front/src/modules/settings/hooks/useSettingsNavigationItems.tsx

@@ -20,7 +20,6 @@ import {
   IconFunction,
   IconHierarchy2,
   IconKey,
-  IconLayout,
   IconLock,
   IconMail,
   IconRocket,
@@ -64,9 +63,6 @@ const useSettingsNavigationItems = (): SettingsNavigationSection[] => {
     (currentUser?.canImpersonate || currentUser?.canAccessFullAdminPanel) ??
     false;
   const isAIEnabled = useIsFeatureEnabled(FeatureFlagKey.IS_AI_ENABLED);
-  const isPageLayoutEnabled = useIsFeatureEnabled(
-    FeatureFlagKey.IS_PAGE_LAYOUT_ENABLED,
-  );
 
   const permissionMap = usePermissionFlagMap();
   return [
@@ -144,15 +140,6 @@ const useSettingsNavigationItems = (): SettingsNavigationSection[] => {
           isHidden:
             !isBillingEnabled || !permissionMap[PermissionFlagType.WORKSPACE],
         },
-        {
-          label: t`Page Layouts`,
-          path: SettingsPath.PageLayout,
-          Icon: IconLayout,
-          isHidden:
-            !isPageLayoutEnabled ||
-            !permissionMap[PermissionFlagType.WORKSPACE],
-          isNew: true,
-        },
         {
           label: t`APIs & Webhooks`,
           path: SettingsPath.ApiWebhooks,