parcel + gh-pages (feat: TypeScript)

1. TypeScript로 코딩하고,
2. parcel로 dist 폴더 bundle 하고,
3. gh-pases branch로 배포한다.

참고)

• https://lts0606.tistory.com/449
• https://www.digitalocean.com/community/tutorials/js-axios-vanilla-js
• https://github.com/parcel-bundler/parcel/issues/206
• https://gist.github.com/cobyism/4730490
• https://stackoverflow.com/questions/42469817/host-github-pages-from-dist-folder-in-master-branch