This replaces all `nx` commands with `turbo` commands and removes Nx from the repository. All of the `project.json` files have been removed and any commands that broke with Turborepo have been adjusted.
- moved and updated .vscode/tasks.json up to root level, and add exclusion to .gitignore
- added --pretty to ts:check in wca package.json (because otherwise there's no syntax highlighting in the output, not sure why this is needed with nx and not without)
- added references to root tsconfig.base.json
- update development.md with instructions for ts checking