Migrate CascadingMenu changes to new @mui paradigm

Migrate MenuItem changes


Migrating SubMenu addition




Migrating MenuList changes


Remove files from old path after migration


Fix a couple of missed migration things


Update docs:api


Update Cascading Menu demo to new imports


Update submenu import path


linting-fix

docs/pages/api-docs/sub-menu.json

@@ -3,9 +3,8 @@
   "name": "SubMenu",
   "styles": { "classes": [], "globalClasses": {}, "name": null },
   "spread": true,
-  "filename": "/packages/material-ui/src/SubMenu/SubMenu.js",
+  "filename": "/packages/mui-material/src/SubMenu/SubMenu.js",
   "inheritance": null,
   "demos": "<ul><li><a href=\"/components/menus/\">Menus</a></li></ul>",
-  "styledComponent": true,
   "cssComponent": false
 }

docs/src/pages/components/menus/CascadingMenu.js

@@ -1,9 +1,9 @@
 import React, { useState } from 'react';
-import Button from '@material-ui/core/Button';
-import Menu from '@material-ui/core/Menu';
-import MenuItem from '@material-ui/core/MenuItem';
-import SubMenu from '@material-ui/core/SubMenu';
-import useTheme from '@material-ui/styles/useTheme';
+import Button from '@mui/material/Button';
+import Menu from '@mui/material/Menu';
+import MenuItem from '@mui/material/MenuItem';
+import SubMenu from '@mui/material/SubMenu';
+import useTheme from '@mui/styles/useTheme';
 
 export default function CascadingMenu() {
   const theme = useTheme();