* Fix just lint to check all targets
* Fix yarn test:rust to lint all targets
* Remove redundant options
* Change cargo --all to --workspace
* Update readme to use just command
Now the process for adding a new KCL test is:
- `cd src/wasm-lib`
- Write a new .kcl file in the `tests/inputs` directory, e.g. `tests/inputs/foo.kcl`
- Run `just new-test foo`
- That created `tests/outputs/foo.png`, so open it and check it looks correct
- Commit changes and open a PR
