[BUILD][DOCS] Migrate VTA CI, test, build, docs

CMakeLists.txt

Jenkinsfile

Makefile

apps/pynq_rpc/start_rpc_server.sh

cmake/modules/VTA.cmake

docs/Doxyfile

docs/Makefile

docs/README.txt

docs/api/python/hybrid.rst

docs/api/python/index.rst

docs/api/python/vta/index.rst

docs/conf.py

docs/index.rst

docs/install/index.rst

docs/vta/.gitignore

docs/vta/hardware.rst

docs/vta/index.rst

docs/vta/install.md

tests/scripts/task_python_vta.sh

vta/CONTRIBUTORS.md