When you unpublish your site, your current deployment is removed and the site will no longer be available. Any existing repository settings or content will not be affected.
Unpublishing a site does not permanently delete the site. For information on deleting a site, see "Deleting a GitHub Pages site."
Unpublishing a project site
-  On your GitHub Enterprise Server instance, navigate to the main page of the repository. 
-  If a gh-pagesbranch exists in the repository, delete thegh-pagesbranch. For more information, see "Creating and deleting branches within your repository."
-  If the gh-pagesbranch was your publishing source, your site is now unpublished and you can skip the remaining steps.
-  Under your repository name, click Settings. If you cannot see the "Settings" tab, select the dropdown menu, then click Settings.  
-  In the "Code and automation" section of the sidebar, click Pages. 
-  Under "GitHub Pages", use the branch dropdown menu and select None.  
Unpublishing a user or organization site
- On your GitHub Enterprise Server instance, navigate to the main page of the repository.
- Delete the branch that you're using as a publishing source, or delete the entire repository. For more information, see "Creating and deleting branches within your repository" and "Deleting a repository."
Re-enabling a site that has been unpublished
Unpublishing your GitHub Pages site removes your current deployment. To make your site available again, you can create a new deployment.
Re-enabling a project site
- Configure your publishing source to publish from a branch of your choosing. For more information, see "Configuring a publishing source for your GitHub Pages site."
- Commit to your publishing source to create a new deployment.
Re-enabling a user or organization site
Because your publishing source was deleted during unpublishing, you will need to create a new publishing source and configure a new GitHub Pages site. For more information, see "Configuring a publishing source for your GitHub Pages site."