refactor: remove rtk-query-polling example from monorepo

.prettierignore

@@ -9,3 +9,4 @@ node_modules
 __snapshots__
 dev
 .yarn/*
+**/.yarn/*

package.json

@@ -69,7 +69,6 @@
     "packages/react-json-tree/examples",
     "packages/redux-devtools/examples/counter",
     "packages/redux-devtools/examples/todomvc",
-    "packages/redux-devtools/examples/rtk-query-polling",
     "packages/redux-devtools-slider-monitor/examples/todomvc"
   ],
   "engines": {

packages/redux-devtools-rtk-query-inspector-monitor/demo/.gitignore

@@ -1,4 +1,4 @@
 .snowpack
 build
 node_modules
-.yarn
+.yarn/*

packages/redux-devtools/examples/rtk-query-polling/.gitignore

@@ -0,0 +1,3 @@
+.yarn/*
+build
+node_modules

packages/redux-devtools/examples/rtk-query-polling/README.md

@@ -7,11 +7,22 @@ adds a connection via `remote-redux-devtools` to a devtools server.
 
 ## Run example
 
+Runs the example at `localhost:3002`, `devtools-app` at `localhost:3000` and remote server at `8000`.
+
+1. Install local dependencies
+
 ```bash
-yarn lerna run --parallel start \
+yarn exec --cwd 'packages/redux-devtools/examples/rtk-query-polling' yarn
-  --scope 'rtk-query-polling' \
-  --scope '@redux-devtools/app' \
-  --scope '@redux-devtools/cli'
 ```
 
-Runs the example at `localhost:3002`, `app` at `localhost:3000` and remote server at `8000`.
+2. Start example
+
+```bash
+yarn exec --cwd 'packages/redux-devtools/examples/rtk-query-polling' yarn start
+```
+
+3. Start devtools in another shell
+
+```bash
+yarn lerna run --parallel start  --scope '@redux-devtools/app' --scope '@redux-devtools/cli'
+```

packages/redux-devtools/examples/rtk-query-polling/package.json

@@ -9,13 +9,13 @@
     "react": "^17.0.0",
     "react-dom": "^17.0.0",
     "react-redux": "7.2.2",
-    "react-scripts": "4.0.2",
     "remote-redux-devtools": "0.5.16"
   },
   "devDependencies": {
     "@types/react": "17.0.0",
     "@types/react-dom": "17.0.0",
     "@types/react-redux": "7.1.9",
+    "react-scripts": "4.0.3",
     "typescript": "4.3.2"
   },
   "eslintConfig": {