netlify.toml

[build]
  base = "site/"
  command = "jekyll build"
  publish = "site/_site"
[build.processing]
  skip_processing = false # -> Enable processing
[build.processing.css]
  bundle = true # -> Concatenate consecutive CSS files together to reduce HTTP requests.
  minify = true # -> Run CSS through a minifier to reduce file size.
[build.processing.js]
  bundle = true # -> Concatenate consecutive JS files together to reduce HTTP requests.
  minify = true # -> Run JS through a minifier to reduce file size.
[build.processing.images]
  compress = true # -> Run all images through lossless image compression.

# Reference documentation
# Optimization blog post: https://www.netlify.com/blog/2019/08/05/control-your-asset-optimization-settings-from-netlify.toml/
# How to guide: https://docs.netlify.com/configure-builds/file-based-configuration/#post-processing