Here are all necessary steps if you need to migrate a github repository from one organization to another and you want to include history of commits, branches, and tags:
1.Open terminal and clone the source repo using the following command:
git clone --bare https://github.com/sourcerepo.git
It will create a local folder i.e. sourcerepo.git, cd into it
Push the change to the target folder using the following command:
git push --mirror https://github.com/targetrepo.git
