Add husky hooks, CI tests and purge dependencies

[Siegrift]

• Setup Husky with pre-push hook - I've only added pre-push hook (because pre-commit is unusable if you do rebase) and I've only included prettier and eslint. Let me know if you prefer also tsc and tests.
• Add GH actions lint/test
• Make lint and tests pass
• Purge and make consistent use of dependencies. Each workspace defines it's own dependencies, but I moved common dev dependencies to monorepo root. This makes it convenient because the the project doesn't need to install it and all projects will use the same version by default.

[andreogle]

Are these files needed?

[Siegrift]

#4 (comment)