build: add new deploy process w/ gh-pages script

[fsciuti]

Hi @NOtherDev, I added a new simple deploy process with a gh-pages library script. You can test this by running npm run deploy-gh-pages command.

Test it on a fork and I didn't try it on custom domain, please and tell me if it works for you!

P.S. I had to remove type="module" row on package.json on my environment to run Sapper...have you the same issue?

[NOtherDev]

Perfect @fsciuti, worked like a charm! 🚀