docs(palimpsest): add static side nav with components

palimpsest/src/components/carbon-components/Accordion/Preview.svelte

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+<script>
+  import {
+    Accordion,
+    AccordionItem,
+    ToggleSmall,
+    NumberInput,
+    FormGroup
+  } from 'carbon-components-svelte';
+  import { ComponentPreview } from '../../Component';
+
+  $: items = [1, 2, 3, 4].map(id => ({ id, open: false }));
+
+  $: props = {
+    count: 4,
+    open: false,
+    skeleton: false
+  };
+
+  $: if (props.skeleton) {
+    items = items.map(_ => ({ ..._, open: false }));
+  }
+
+  $: code = `
+<script>
+  import { Accordion, AccordionItem } from 'carbon-components-svelte';
+< /script>
+
+<Accordion${props.skeleton ? ' skeleton' : ''}${props.skeleton ? ` count={${props.count}}` : ''}${
+    props.open ? ` open` : ''
+  }>
+${items
+  .map(item => {
+    return `  <AccordionItem title="Item ${item.id}"${item.open ? ' open' : ''}>Item ${
+      item.id
+    } content</AccordionItem>`;
+  })
+  .join('\n')}
+</Accordion>
+  `;
+</script>
+
+<ComponentPreview {code} minHeight="16rem">
+  <Accordion {...props}>
+    {#each items as { id }, i (id)}
+      <AccordionItem title={`Item ${id}`} bind:open={items[i].open}>
+        Item {id} content
+      </AccordionItem>
+    {/each}
+  </Accordion>
+  <div slot="props">
+    <FormGroup legendText="Skeleton">
+      <ToggleSmall id="toggle-skeleton" bind:toggled={props.skeleton} />
+    </FormGroup>
+    <FormGroup legendText="Skeleton row count">
+      <NumberInput disabled={!props.skeleton} bind:value={props.count} />
+    </FormGroup>
+    <FormGroup legendText="Skeleton first item open">
+      <ToggleSmall id="toggle-open" disabled={!props.skeleton} bind:toggled={props.open} />
+    </FormGroup>
+  </div>
+</ComponentPreview>