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/page-layout/utils/calculateGridCellPosition.ts

@@ -0,0 +1,12 @@
+export const calculateGridCellPosition = ({
+  index,
+  numberOfColumns,
+}: {
+  index: number;
+  numberOfColumns: number;
+}) => {
+  const column = index % numberOfColumns;
+  const row = Math.floor(index / numberOfColumns);
+
+  return { row, column };
+};