message: fix dev page for iLert plugin
diff: import React from 'react';
  import { createDevApp } from '@backstage/dev-utils';
  import { ilertPlugin } from '../src/plugin';
  -import { IlertPage } from '../src';
  +import { ILertPage } from '../src';
  createDevApp()
  .registerPlugin(ilertPlugin)
  .addPage({
  - element: <IlertPage />,
  + element: <ILertPage />,
  title: 'Root Page',
  })
  .render();
  