[#819,xlsx][m]: remove data-literate, excel and everything related to the xlsx dependency (#845)

site/pages/data-literate/demo.tsx

@@ -1,23 +0,0 @@
-import fs from "fs";
-
-import parse from "../../lib/data-literate/markdown";
-
-import DataLiterate from "../../components/data-literate/DataLiterate";
-
-export default function PostPage({ source, frontMatter }) {
-  return <DataLiterate source={source} frontMatter={frontMatter} />;
-}
-
-export const getStaticProps = async ({ params }) => {
-  const mdxPath = "content/data-literate/demo.mdx";
-  const source = fs.readFileSync(mdxPath);
-
-  const { mdxSource, frontMatter } = await parse(source);
-
-  return {
-    props: {
-      source: mdxSource,
-      frontMatter: frontMatter,
-    },
-  };
-};

site/pages/excel-viewer.js

@@ -1,12 +0,0 @@
-import Head from 'next/head'
-import SheetJSApp from '../components/ExcelViewerApp.js'
-import Layout from '../components/Layout'
-
-export default function Index() {
-  return (
-    <Layout title='Excel Viewer'>
-      <h1>Excel Viewer</h1>
-      <SheetJSApp />
-    </Layout>
-  )
-}