Patch: Dropdown to Radio, Add Prettier, Tweak Super-Linter

• Convert dropdowns to radio buttons
  • As advised by https://learnui.design/blog/4-rules-intuitive-ux.html#2-abd-anything-but-dropdowns and https://tomkenny.design/articles/false-simplicity
  • Closes #15
• Tweaks to make Super-Linter pass and run more smoothly
• Add Prettier and check it on PRs and pushes to master