message: Improvide dev page of explore plugin
diff: import { Entity } from '@backstage/catalog-model';
  import { createDevApp } from '@backstage/dev-utils';
  -import { CatalogApi, catalogApiRef } from '@backstage/plugin-catalog';
  +import { CatalogApi, catalogApiRef } from '@backstage/plugin-catalog-react';
  +import { exploreToolsConfigRef } from '@backstage/plugin-explore-react';
  import React from 'react';
  -import { ExplorePage } from '../src/extensions';
  +import { ExplorePage, explorePlugin } from '../src';
  +import { exampleTools } from '../src/util/examples';
  createDevApp()
  + .registerPlugin(explorePlugin)
  + .registerApi({
  + api: exploreToolsConfigRef,
  + deps: {},
  + factory: () => ({
  + async getTools() {
  + return exampleTools;
  + },
  + }),
  + })
  .registerApi({
  api: catalogApiRef,
  deps: {},
  