Update ts-npm-config post for 2020
Update ts-npm-config post for 2020

- Add explanation of npm pack
- Use ESLint instead of TSLint
- Update ESLint rule count
- Update Mocha config for 7.2.0
- Simplify Prettier config for Prettier 2.0
- Fix typos

MaximeKjaer/MaximeKjaer.github.io,MaximeKjaer/kjaermaxi.me,MaximeKjaer/MaximeKjaer.github.io,MaximeKjaer/kjaer.io,MaximeKjaer/kjaermaxi.me,MaximeKjaer/kjaermaxi.me,MaximeKjaer/MaximeKjaer.github.io,MaximeKjaer/kjaer.io,MaximeKjaer/kjaer.io,MaximeKjaer/kjaermaxi.me,MaximeKjaer/MaximeKjaer.github.io,MaximeKjaer/kjaer.io