chore: lift components folder

src/FormItem/FormItem.Story.svelte

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+<script>
+  import { NumberInput } from "../NumberInput";
+  import FormItem from "./FormItem.svelte";
+</script>
+
+<FormItem>
+  <NumberInput id="number-input-1" />
+</FormItem>

src/FormItem/FormItem.stories.js

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+import { withKnobs } from "@storybook/addon-knobs";
+import Component from "./FormItem.Story.svelte";
+
+export default { title: "FormItem", decorators: [withKnobs] };
+
+export const Default = () => ({ Component });

src/FormItem/FormItem.svelte

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+<div
+  class:bx--form-item={true}
+  {...$$restProps}
+  on:click
+  on:mouseover
+  on:mouseenter
+  on:mouseleave>
+  <slot />
+</div>

src/FormItem/index.js

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+export { default as FormItem } from "./FormItem.svelte";