Fail Gherkin typos early for regular files and generators/generated files

[plocket]

We'll use the Gherkin parser to parse regular author files and generator/generated (upcoming) files before installing the package on the server and before creating the GitHub server. Since we need to generate the tests before running cucumber anyway, we might as well put these processes at the front.

Cross-cutting concerns

We'll need to change how we deal with the artifacts path var (and potentially edit the documentation of it, which we need to do anyway to add other parts of ALKilnInThePlayground using the artifacts path). This might be as minor as clearing runtime_config.js at the very end in yet another separate script so that ALKilnInThePlayground can use its value or as major as creating the name externally in every environment and potentially using an env var to store it for the run.