Explanation of the recent history rewrite / demo site removal

[danielfdickinson]

Full article:

https://www.wildtechgarden.ca/devel/hugo/two-repo-netlify-technique-for-module-ci/

Basically, having the demo/test site in the module results in Hugo pulling the demo/test site with every use of the module, which eats bandwidth like a fiend. Removing the demo site from git clone (which Go modules, which Hugo uses for its modules, uses) requires purging it from the Git repository even for old commits.