The relative import path for modules seems to not work or is unclear to me#22

Hey! Thanks a lot for this amazing boilerplate! Unfortunately when trying to use it I run into ``` Failed to load module script: Expected a JavaScript module script but the server responded with a MIME type of "text/html". Strict MIME type checking is enforced for module scripts per HTML spec. ``` which happens because the `../../..` module import in the generated `workerHelper.js` points to `/` somehow which ofc is HTML and not JS. Am I holding this wrong? I initialize the boilerplate seemingly correct with a `<script type="module"></srcipt>` tag. This might as well be an issue with `trunk` not serving a file as expected, but for all I can gather from Chrome & Firefox, it is something with the actual module hierarchy.