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/CustomMuiTheme.tsx

@@ -0,0 +1,39 @@
+import React, { Component } from 'react';
+
+import { CssBaseline } from '@material-ui/core';
+import { MuiThemeProvider, createMuiTheme, StylesProvider } from '@material-ui/core/styles';
+import { blueGrey, indigo, orange, red, green } from '@material-ui/core/colors';
+
+const theme = createMuiTheme({
+  palette: {
+    primary: indigo,
+    secondary: blueGrey,
+    info: {
+      main: blueGrey[900]
+    },
+    warning: {
+      main: orange[500]
+    },
+    error: {
+      main: red[500]
+    },
+    success: {
+      main: green[500]
+    }
+  },
+});
+
+export default class CustomMuiTheme extends Component {
+
+  render() {
+    return (
+      <StylesProvider>
+        <MuiThemeProvider theme={theme}>
+          <CssBaseline />
+          {this.props.children}
+        </MuiThemeProvider>
+      </StylesProvider>
+    );
+  }
+
+}