Move yoga docs into docs folder on master branch

Summary: Move yoga docs into master branch so that pull requests are able to include doc updates as part of other changes.

Reviewed By: JoelMarcey

Differential Revision: D4365700

fbshipit-source-id: 2f46a88974104c454c00bcdf1257abb5c4075a68

docs/_data/authors.yml

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+
+exampleauthor:
+  full_name: Example Author
+  fbid: 1234

docs/_data/features.yml

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+# Add features here if you are using:
+# {% include content/gridblocks.html data_source=site.data.features align="center" %}

docs/_data/nav.yml

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+- title: Documentation
+  href: docs/
+  category: api
+
+- title: GitHub
+  href: https://github.com/facebook/yoga
+  category: external
+
+# Use external for external links not associated with the paths of the current site.
+# If a category is external, site urls, for example, are not prepended to the href, etc..

docs/_data/nav_docs.yml

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+- title: Quick Start
+  items:
+  - id: getting-started
+  - id: learn-more
+- title: Flexbox concepts
+  items:
+  - id: flex-direction
+  - id: justify-content
+  - id: flex-wrap
+  - id: alignment
+  - id: flex
+  - id: absolute-position
+  - id: min-max-dimen
+  - id: margin-padding-border
+- title: Yoga additions
+  items:
+  - id: aspect-ratio
+  - id: rtl
+- title: API
+  items:
+  - id: c
+  - id: objc
+  - id: java
+  - id: csharp

docs/_data/powered_by.yml

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+# For non-highlighted projects. See format in powered_by_highlight.yml

docs/_data/powered_by_highlight.yml

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+# React Native uses Yoga now. We can add a highlight later when other projects use it.
+#- title: Who Uses This Project?
+#  items:
+#  - name: React Native
+#    url: https://facebook.github.io/react-native
+#    img: static/images/react-native.png

docs/_data/promo.yml

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+# This file determines the list of promotional elements added to the header of \
+# your site's homepage.
+
+- type: plugin_row
+  children:
+  - type: button
+    href: docs/getting-started/
+    text: Get Started
+  - type: button
+    href: docs/learn-more/
+    text: Learn More