Re-engineer UI in TypeScript (#89)

* Re-engineer UI in TypeScript
* Switch to named imports where possible
* Restructure file system layout
* Update depencencies
* Update README.md
* Change explicit colors for better support for dark theme

interface/src/wifi/WiFiConnectionContext.tsx

@@ -0,0 +1,13 @@
+import React from 'react';
+import { WiFiNetwork } from './types';
+
+export interface WiFiConnectionContext {
+  selectedNetwork?: WiFiNetwork;
+  selectNetwork: (network: WiFiNetwork) => void;
+  deselectNetwork: () => void;
+}
+
+const WiFiConnectionContextDefaultValue = {} as WiFiConnectionContext
+export const WiFiConnectionContext = React.createContext(
+  WiFiConnectionContextDefaultValue
+);