How to deploy a Angular app to GitHub Pages 
In this tutorial, we are going to learn about deploying an angular app to GitHub pages, directly from the angular cli.
Push your angular app to a GitHub repository.
Now, add the
angular-cli-ghpages package to your project by using below command.
ng add angular-cli-ghpages
Run the following command by replacing with
your-projectfolder name and
your-repositoryname to successfully deploy your app to GitHub pages.
ng run your-projectfolder-name:deploy --base-href=/your-repositoryname/
Once you completed all the above steps, now open your project GitHub repository
and click on
settings tab then scroll down to
GitHub Pages section to see your app live URL, like in the below image.