message: protocol designer: use HashRouter for easy S3 static site
diff: import React from 'react'
  -import { BrowserRouter, Route } from 'react-router-dom'
  +import { HashRouter, Route } from 'react-router-dom'
  import Home from './Home'
  import About from './About'
  const App = () => (
  - <BrowserRouter>
  + <HashRouter>
  <div className='container'>
  <Route exact path='/' component={Home} />
  <Route path='/about' component={About} />
  </div>
  - </BrowserRouter>
  + </HashRouter>
  )
  export default App
  