git multiple remotes/upstreams

[nnop]

• https://www.atlassian.com/git/articles/git-forks-and-upstreams
• https://mmikowski.github.io/git-cross-origin/

[nnop]

• Configuring a remote for a fork
• Git Forks And Upstreams: How-to and a cool tip
• https://stackoverflow.com/questions/38837705/what-is-the-difference-between-origin-and-remote-in-git-commands
• https://stackoverflow.com/questions/4410091/github-import-upstream-branch-into-fork
• https://stackoverflow.com/questions/14680711/how-to-do-a-github-pull-request
• https://stackoverflow.com/questions/9257533/what-is-the-difference-between-origin-and-upstream-on-github