Upgrade to Next.js 11, remove extraneous dependencies

[karlhorky]

Hi @ChangoMan!

Would you consider upgrading to Next.js 11 (which has a bunch of improvements, including built-in support for Sass) and then removing the extraneous dependencies?

This would also help to address the security vulnerabilities with the old dependencies.

I helped recently doing this to another site, and these are some of the changes:

https://github.com/jonaschlegel/jonaschlegel.com/commits/master

Only 4 dependencies required with this new version:

{
  "name": "nextjs-forty",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "dev": "next",
    "build": "next build",
    "start": "next start",
    "export": "next build && next export"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "next": "^11.0.1",
    "react": "^17.0.2",
    "react-dom": "^17.0.2",
    "sass": "^1.35.2"
  }
}

...and also managed to get rid of all of the *.config.js files 🙌 : https://github.com/jonaschlegel/jonaschlegel.com/tree/master