refactor: AppContext and App entrypoints

new-lamassu-admin/src/index.js

@@ -1,10 +1,28 @@
 import React from 'react'
 import ReactDOM from 'react-dom'
 
-import App from './App'
 import * as serviceWorker from './serviceWorker'
 
-ReactDOM.render(<App />, document.getElementById('root'))
+function importBuildTarget() {
+  if (process.env.REACT_APP_BUILD_TARGET === 'LAMASSU') {
+    return import('./App')
+  } else if (process.env.REACT_APP_BUILD_TARGET === 'PAZUZ') {
+    return import('./pazuz/App')
+  } else {
+    return Promise.reject(
+      new Error('No such build target: ' + process.env.REACT_APP_BUILD_TARGET)
+    )
+  }
+}
+
+importBuildTarget().then(({ default: Environment }) =>
+  ReactDOM.render(
+    <React.StrictMode>
+      <Environment />
+    </React.StrictMode>,
+    document.getElementById('root')
+  )
+)
 
 // If you want your app to work offline and load faster, you can change
 // unregister() to register() below. Note this comes with some pitfalls.