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

docs/tutorials/bundle_adjustment.ipynb

@@ -11,15 +11,6 @@
     "# Copyright (c) Facebook, Inc. and its affiliates. All rights reserved."
    ]
   },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "<a href=\"https://colab.research.google.com/github/facebookresearch/pytorch3d/blob/master/docs/tutorials/bundle_adjustment.ipynb\">\n",
-    "  <img align=\"left\" src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/>\n",
-    "</a>"
-   ]
-  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -40,10 +31,10 @@
     "where $d(g_i, g_j)$ is a suitable metric that compares the extrinsics of cameras $g_i$ and $g_j$. \n",
     "\n",
     "Visually, the problem can be described as follows. The picture below depicts the situation at the beginning of our optimization. The ground truth cameras are plotted in green while the randomly initialized estimated cameras are plotted in blue:\n",
-    "![Initialization](./data/bundle_adjustment_initialization.png)\n",
+    "![Initialization](data/bundle_adjustment_initialization.png)\n",
     "\n",
     "Our optimization seeks to align the estimated (blue) cameras with the ground truth (green) cameras, by minimizing the discrepancies between pairs of relative cameras. Thus, the solution to the problem should look as follows:\n",
-    "![Solution](./data/bundle_adjustment_final.png)\n",
+    "![Solution](data/bundle_adjustment_final.png)\n",
     "\n",
     "In practice, the camera extrinsics $g_{ij}$ and $g_i$ are represented using objects from the `SfMPerspectiveCameras` class initialized with the corresponding rotation and translation matrices `R_absolute` and `T_absolute` that define the extrinsic parameters $g = (R, T); R \\in SO(3); T \\in \\mathbb{R}^3$. In order to ensure that `R_absolute` is a valid rotation matrix, we represent it using an exponential map (implemented with `so3_exponential_map`) of the axis-angle representation of the rotation `log_R_absolute`.\n",
     "\n",
@@ -421,9 +412,9 @@
   },
   "file_extension": ".py",
   "kernelspec": {
-   "display_name": "pytorch3d (local)",
+   "display_name": "p3d_dev7",
    "language": "python",
-   "name": "pytorch3d_local"
+   "name": "p3d_dev7"
   },
   "language_info": {
    "codemirror_mode": {
@@ -435,7 +426,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.5+"
+   "version": "3.7.6"
   },
   "mimetype": "text/x-python",
   "name": "python",