Rearrange files and projects to match #16 (#17)

.github/ISSUE_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

CODEOWNERS

CONTRIBUTING.md

README.md

directory_template/README.md

images/Dockerfile.linux.cpu

images/README.md

manylinux2014_docker_images/Dockerfile.manylinux2014.cpu

manylinux2014_docker_images/README.md

manylinux2014_docker_images/install/bazelrc

manylinux2014_docker_images/install/install_bazel.sh

manylinux2014_docker_images/install/install_buildifier.sh

manylinux2014_docker_images/install/install_deb_packages.sh

manylinux2014_docker_images/install/install_golang.sh

manylinux2014_docker_images/install/install_pip_packages.sh

manylinux2014_docker_images/install/install_proto3.sh

manylinux2014_docker_images/install/install_rpm_packages.sh

ppc64le_builds/README.md

ppc64le_builds/images/cpu/Dockerfile.manylinux_2014