Setup website with docusaurus (#11)

Summary:
Set up landing page, docs page, and html versions of the ipython notebook tutorials.
Pull Request resolved: https://github.com/fairinternal/pytorch3d/pull/11

Reviewed By: gkioxari

Differential Revision: D19730380

Pulled By: nikhilaravi

fbshipit-source-id: 5df8d3f2ac2f8dce4d51f5d14fc336508c2fd0ea

website/pages/en/help.js

@@ -0,0 +1,51 @@
+/**
+ * Copyright (c) 2017-present, Facebook, Inc.
+**/
+
+const React = require('react');
+
+const CompLibrary = require('../../core/CompLibrary.js');
+
+const Container = CompLibrary.Container;
+const GridBlock = CompLibrary.GridBlock;
+
+function Help(props) {
+  const {config: siteConfig, language = ''} = props;
+  const {baseUrl, docsUrl} = siteConfig;
+  const docsPart = `${docsUrl ? `${docsUrl}/` : ''}`;
+  const langPart = `${language ? `${language}/` : ''}`;
+  const docUrl = doc => `${baseUrl}${docsPart}${langPart}${doc}`;
+
+  const supportLinks = [
+    {
+      content: `Learn more using the [documentation on this site.](${docUrl(
+        'doc1.html',
+      )})`,
+      title: 'Browse Docs',
+    },
+    {
+      content: 'Ask questions about the documentation and project',
+      title: 'Join the community',
+    },
+    {
+      content: "Find out what's new with this project",
+      title: 'Stay up to date',
+    },
+  ];
+
+  return (
+    <div className="docMainWrapper wrapper">
+      <Container className="mainContainer documentContainer postContainer">
+        <div className="post">
+          <header className="postHeader">
+            <h1>Need help?</h1>
+          </header>
+          <p>This project is maintained by a dedicated group of people.</p>
+          <GridBlock contents={supportLinks} layout="threeColumn" />
+        </div>
+      </Container>
+    </div>
+  );
+}
+
+module.exports = Help;