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.

Reviewed By: yungsters

Differential Revision: D46884434

fbshipit-source-id: ee388aa9388b1030dbbf59a73dd1529fee05065c

website-next/blog/2019-05-29-long-blog-post.md

@@ -0,0 +1,44 @@
+---
+slug: long-blog-post
+title: Long Blog Post
+authors: endi
+tags: [hello, docusaurus]
+---
+
+This is the summary of a very long blog post,
+
+Use a `<!--` `truncate` `-->` comment to limit blog post size in the list view.
+
+<!--truncate-->
+
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