[VOL-1621] Initial documentation framework

Change-Id: Idb7f3e7b859ed3259021aace30a7053a684818e7
diff --git a/.gitignore b/.gitignore
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+# build related
+doc_venv
+_build
+repos
+
+# subrepos
+bbsim
+pyvoltha
+voltha-go
+voltha-openolt-adapter
+voltha-openonu-adapter
+voltha-protos
+voltha-system-tests