Initial Sphinx-based documentation templates and infra

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+Installation
+************
+
+BOM
+===
+
+Edgecore Switches
+=================
+
+Install ONOS
+------------
+
+Install ONL
+-----------
+
+Install OF-DPA
+--------------
+
+QCT Switches
+============
+
+Install ONOS
+------------
+
+Install ONL
+-----------
+
+Install OF-DPA
+--------------
+
+Delta Switches
+==============
+
+Install ONOS
+------------
+
+Install ONL
+-----------
+
+Install OF-DPA
+--------------
+
+Trellis in a Box (TiaB)
+=======================