Console: improve DX + refactor

[Evalir]

Right now the console repo could use some love (but feel free to lift any of these to the general monorepo):

• DX / Contributor related:

  • Let's add pre-commit hooks for linting.
  • Let's add bundlewatch to track the app size. It should be as small as possible.
  • Let's add a CONTRIBUTING.md and a SETUP_GUIDE.md for people to get running with the console.
  • Let's freshen up the Console README.md.
  • Let's add Sentry for error tracking.
  • Let's start doing some testing for several components. We can start small and move upwards slowly.
  • Let's move to Snowpack (Needs these changes on use-wallet)

• Refactor related:

  • Eliminate the remaining js files (mostly battle-tested utils lifted from other projects). (PR: Console: remove console warnings #261)
  • Settle down on a way to organize types.
  • Let's add a global error handler.
  • Let's add a 404 page.
  • Let's upgrade to React 17 and react-scripts ^4.0.1 (Currently a hassle, might be done in a separate PR as a lot of tooling might be affected)
  • Let's track the used chain id through the URL and move the state coupled to React.
  • Let's sweep through the codebase and try to eliminate most, if not all, any type declarations.
  • Let's start to form a folder where we can keep the theme used throughout the repo, and all pure UI components (buttons, boxes, etc)

[Evalir]

@bpierre would love some feedback if you have any ideas! I wanna make this as clean and high quality as we can 😄