npm module about spa-github-pages

[rafgraph]

I think this could be complex with edge cases that make it brittle. The scripts need to be added to the index.html and 404.html files, and depending on build setup these files are not always in the top level (e.g. in create react app they are in the public folder). Also importing the redirect into the spa code seems brittle given the number of spa libraries and build pipelines out there — I think it’s best to have a clear separation between the redirect and spa code. That said, if you want to make a detailed proposal for how this would work I’d consider it.