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/users.js

@@ -0,0 +1,46 @@
+/**
+ * Copyright (c) 2017-present, Facebook, Inc.
+ *
+**/
+
+const React = require('react');
+
+const CompLibrary = require('../../core/CompLibrary.js');
+
+const Container = CompLibrary.Container;
+
+class Users extends React.Component {
+  render() {
+    const {config: siteConfig} = this.props;
+    if ((siteConfig.users || []).length === 0) {
+      return null;
+    }
+
+    const editUrl = `${siteConfig.repoUrl}/edit/master/website/siteConfig.js`;
+    const showcase = siteConfig.users.map(user => (
+      <a href={user.infoLink} key={user.infoLink}>
+        <img src={user.image} alt={user.caption} title={user.caption} />
+      </a>
+    ));
+
+    return (
+      <div className="mainContainer">
+        <Container padding={['bottom', 'top']}>
+          <div className="showcaseSection">
+            <div className="prose">
+              <h1>Who is Using This?</h1>
+              <p>This project is used by many folks</p>
+            </div>
+            <div className="logos">{showcase}</div>
+            <p>Are you using this project?</p>
+            <a href={editUrl} className="button">
+              Add your company
+            </a>
+          </div>
+        </Container>
+      </div>
+    );
+  }
+}
+
+module.exports = Users;