Keep gh-pages up to date with a master branch

Sync gh-pages + master branches

// Reference: http://lea.verou.me/2011/10/easily-keep-gh-pages-in-sync-with-master/

// I have changed "master" with main, and used "switch" instead of "checkout". - @harmancode

$ git add .
$ git status // to see what changes are going to be commited
$ git commit -m 'Some descriptive commit message'
$ git push origin main

$ git switch gh-pages // go to the gh-pages branch
$ git rebase main // bring gh-pages up to date with master
$ git push origin gh-pages // commit the changes
$ git switch main // return to the master branch