These archives made it difficult to find things in the GitHub interface, and take up a lot of space in a checked-out repo for something that is not useful to most people checking out the repository.

The main purpose of these archives is to make old versions and documentation available on the Sinon website that is run out of this repo. This can be supported by using a separate branch for website releases, and to maintain the archives.

Following this commit, the npm version scripts will be updated to