merge: First tutorial + Example (#804)

## Changes:

- /docs is now a Getting Started page with the first tutorial
- basic-example added

examples/basic-example/pages/_app.tsx

@@ -0,0 +1,6 @@
+import '../styles/globals.css'
+import type { AppProps } from 'next/app'
+
+export default function App({ Component, pageProps }: AppProps) {
+  return <Component {...pageProps} />
+}

examples/basic-example/pages/api/get-data-file.ts

@@ -0,0 +1,20 @@
+// Next.js API route support: https://nextjs.org/docs/api-routes/introduction
+import type { NextApiRequest, NextApiResponse } from 'next'
+import { promises as fs } from 'fs';
+import path from 'path';
+
+export default async function handler(
+  req: NextApiRequest,
+  res: NextApiResponse<string>
+) {
+  const contentDir = path.join(process.cwd(), '/content');
+  const datasets = await fs.readdir(contentDir);
+  const query = req.query;
+  const { fileName } = query;
+  const dataFile = path.join(
+    process.cwd(),
+    '/content/' + datasets[0] + '/' + fileName
+  );
+  const data = await fs.readFile(dataFile, 'utf8');
+  res.status(200).send(data)
+}

examples/basic-example/pages/index.tsx

@@ -0,0 +1,47 @@
+import { GetStaticProps } from 'next';
+import { promises as fs } from 'fs';
+import path from 'path';
+import parse from '../lib/markdown';
+import DRD from '../components/DRD';
+
+export const getStaticProps: GetStaticProps = async (context) => {
+  const contentDir = path.join(process.cwd(), '/content');
+  const datasets = await fs.readdir(contentDir);
+  const datasetReadme = path.join(
+    process.cwd(),
+    '/content/' + datasets[0] + '/README.md'
+  );
+  const readme = await fs.readFile(datasetReadme, 'utf8');
+  let { mdxSource, frontMatter } = await parse(readme, '.mdx');
+  return {
+    props: {
+      mdxSource,
+      frontMatter,
+    },
+  };
+};
+
+export default function DatasetPage({ mdxSource, frontMatter }) {
+  return (
+    <div className="prose mx-auto">
+      <header>
+        <div className="mb-6">
+          <>
+            <h1>{frontMatter.title}</h1>
+            {frontMatter.author && (
+              <div className="-mt-6">
+                <p className="opacity-60 pl-1">{frontMatter.author}</p>
+              </div>
+            )}
+            {frontMatter.description && (
+              <p className="description">{frontMatter.description}</p>
+            )}
+          </>
+        </div>
+      </header>
+      <main>
+        <DRD source={mdxSource} />
+      </main>
+    </div>
+  );
+}