Initial Sphinx-based documentation templates and infra

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+Trellis Documentation
+*********************
+
+This documents the Trellis project
+
+.. toctree::
+   :maxdepth: 1
+   :caption: Table of Content
+
+   intro
+   architecture
+   installation
+   configuration
+   operation
+   troubleshooting
+   testing
+   community
+
+
+.. toctree::
+   :maxdepth: 1
+   :caption: Documentation Notes
+
+   readme