Docusarus: Init Project

Summary:
This starts us transitioning the Yoga website off of an ancient version of Gatsby by initializing a new Docusaurus project. This commit adds a new stock project, to be filled in later, then fixes license lint errors.

Note that this seems to have init'd using npm, but in the next diff I convert this to yarn workspaces anyway.

Differential Revision: D46884434

fbshipit-source-id: 26e2ecba057ae99c4ef878e4cd21c8d21a25c2b5

website-next/.docusaurus/docusaurus-plugin-content-pages/default/plugin-route-context-module-100.json

@@ -0,0 +1,4 @@
+{
+  "name": "docusaurus-plugin-content-pages",
+  "id": "default"
+}

website-next/.docusaurus/docusaurus-plugin-content-pages/default/site-src-pages-markdown-page-md-393.json

@@ -0,0 +1,10 @@
+{
+  "type": "mdx",
+  "permalink": "/markdown-page",
+  "source": "@site/src/pages/markdown-page.md",
+  "title": "Markdown page example",
+  "description": "You don't need React to write simple standalone pages.",
+  "frontMatter": {
+    "title": "Markdown page example"
+  }
+}