There are few changes to directories of 1.x specifications
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build ( if you're working on a project that must be built, then this is the directory )
-
configs -> renamed to conf
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data
- var -> moved outside data, in root directory of your project.
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opt -> you should use apps or modules folder instead. Depending on awareness (read 2.x documentation)
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usr -> if you need this you must move this directory under env/ and would be better to rename in "users" to avoid collision with FHS usr/ (Unix System Resources).