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/tutorials/index.js

@@ -0,0 +1,49 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ * @format
+**/
+
+const React = require('react');
+
+const CWD = process.cwd();
+
+const CompLibrary = require(`${CWD}/node_modules/docusaurus/lib/core/CompLibrary.js`);
+const Container = CompLibrary.Container;
+const MarkdownBlock = CompLibrary.MarkdownBlock;
+
+const TutorialSidebar = require(`${CWD}/core/TutorialSidebar.js`);
+const bash = (...args) => `~~~bash\n${String.raw(...args)}\n~~~`;
+
+class TutorialHome extends React.Component {
+  render() {
+    return (
+      <div className="docMainWrapper wrapper">
+        <TutorialSidebar currentTutorialID={null} />
+        <Container className="mainContainer documentContainer postContainer">
+          <div className="post">
+            <header className="postHeader">
+              <h1 className="postHeaderTitle">Welcome to the PyTorch3D Tutorials</h1>
+            </header>
+            <p>
+              Here you can learn about the structure and applications of Pytorch3D from
+              examples which are in the form of ipython notebooks.
+            </p>
+            <h3> Run interactively </h3>
+            <p>
+              At the top of each example you can find a button named <strong>"Open in Colab"</strong> which will open the notebook in <a href="https://colab.research.google.com/notebooks/intro.ipynb"> Google Colaboratory </a> where you can run the code directly in the browser with access to GPU support e.g.
+            </p>
+           <img align="center" src="https://colab.research.google.com/assets/colab-badge.svg" alt="Open In Colab"/>
+           <p> You can modify the code and experiment with varying different settings.
+        Remember to install pytorch, torchvision, fvcore and pytorch3d in the first cell of the colab notebook by running: </p>
+            <MarkdownBlock>{bash`!pip install torch torchvision
+!pip install 'git+https://github.com/facebookresearch/pytorch3d.git`}</MarkdownBlock>
+           <h3> Run locally </h3>
+           <p> There is also a button to download the notebook and source code to run it locally. </p>
+          </div>
+        </Container>
+      </div>
+    );
+  }
+}
+
+module.exports = TutorialHome;