[DOCS] documentation merge

Jenkinsfile

Makefile

docs/Doxyfile

docs/conf.py

include/tvm/api_registry.h

include/tvm/arithmetic.h

include/tvm/base.h

include/tvm/buffer.h

include/tvm/build_module.h

include/tvm/c_dsl_api.h

include/tvm/channel.h

include/tvm/codegen.h

include/tvm/expr.h

include/tvm/ir.h

include/tvm/ir_functor_ext.h

include/tvm/ir_mutator.h

include/tvm/ir_operator.h

include/tvm/ir_pass.h

include/tvm/ir_visitor.h

include/tvm/logging.h