Setup development environment

[Mischback]

Several tools should be in place to support the development:

• NodeJS
  • [x] package.json This is not a NodeJS module, so no complete package.json is required. Provide some minimal meta information, but the focus is tracking dependencies here.
  • [x] Linting
  • [x] lint-staged and simple-git-hooks (#15)
  • [x] prettier (#15)
  • [x] eslint, setup for TypeScript (#16)
  • [x] typechecking using tsc (#16)
  • [x] stylelint (see .stylelintrc @ mischback.de)
    • [x] stylelint-config-standard-scss (#26)
    • [x] stylelint-config-sass-guidelines (#26)
    • [x] stylelint-config-property-sort-order-smaccs (#26)
    • [x] stylelint-config-prettier Not longer required!
  • [ ] https://github.com/ai/size-limit
  • [x] TypeScript (see #11)
  • [x] typescript / tsc (#16)
  • [x] Rollup (#16)
  • [x] testing (jest)? Skipped for now! See #19
  • [x] SASS (see #18)
  • [x] sass (#26)
  • [x] postcss (#26)
• GitHub Actions
  • [ ] Dependabot
  • [ ] gh-actions (monthly)
  • [ ] npm (monthly)
  • [ ] run against development branch
  • [ ] apply auto-approving
  • [ ] development workflow
  • [x] running linters on sources (TS and SASS) (#15)
  • [x] running tests on TS sources? coveralls? Skipped for now! See #19
  • [ ] running build with Rollup (just to verify that this is working!)
  • [ ] release workflow (#30)