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/FieldNumber.stories.js

@@ -0,0 +1,41 @@
+import React from 'react';
+import {useActionState} from './helper';
+import FieldNumber from '../src/components/FieldNumber';
+import {Wrapper} from './ui';
+
+export default {
+  title: 'FieldNumber',
+  component: FieldNumber,
+};
+
+export const Simple = () => {
+  const [value, setValue] = useActionState("onChange", 1);
+
+  return (
+    <Wrapper>
+      <FieldNumber
+        name="number"
+        value={value}
+        onChange={setValue}
+      />
+    </Wrapper>
+  );
+};
+
+export const Range = () => {
+  const [value, setValue] = useActionState("onChange", 1);
+
+  return (
+    <Wrapper>
+      <FieldNumber
+        name="number"
+        value={value}
+        onChange={setValue}
+        min={1}
+        max={24}
+        allowRange={true}
+        rangeStep={1}
+      />
+    </Wrapper>
+  );
+};