Make necessary change to make things work with photon 2.0 docker image.
Remove distro-sync to mitigate the build issue and add `--pull` to docker build
command to make sure the latest photon:2.0 will be pulled during build process.
Signed-off-by: Daniel Jiang <jiangd@vmware.com>
1. Update the nginx.conf
2. Update Makefile
3. Update docker-compose
4. Update image name
5. Rename folder ui to core
6. Change the harbor-ui's package name to core
7. Remove unused static file on harbor-core
8. Remove unused code for harbor-portal
Signed-off-by: Qian Deng <dengq@vmware.com>