Tidy of components

- Moved all components into a single directory like nextjs
 - Made component names consistent with each other
 - Made component names consistent with their export class names
 - Added storybook for a few components with the aim to extend this further.

stories/helper.js

@@ -0,0 +1,12 @@
+import React, {useState} from 'react';
+import {action} from '@storybook/addon-actions';
+
+export function useActionState (name, initialVal) {
+  const [val, fn] = useState(initialVal);
+  const actionFn = action(name);
+  function retFn(val) {
+    actionFn(val);
+    return fn(val);
+  }
+  return [val, retFn];
+}