Hugo: Add HTML tidying as an option

[asomervell]

https://gohugo.io/news/0.69.0-relnotes/

Given the hugo templating engine creates whitespace hell in output now that resources.PostProcess exists it would be awesome to have a similar hook to tidy the output HTML.

Here's a great Go lib that does it perfectly https://github.com/yosssi/gohtml

[bep]

You know you can minify the output?

[asomervell]

Yes. Not really the point though when you're design focused and looking at your DOM output. I know the javascript world has destroyed that but one of the nicest things about hugo is outputting simple, classic static html.

Thanks for all the work you do on hugo 🙏🏽

[bep]

You're right, the HTML output from Go templates leave much to be desired ...

Note that I think this should be implemented in the same place as we do output minification. PostProcess is something ... different (not sure what ... yet).

[fvbommel]

I've written an initial implementation of this: #7825

I'd love some feedback.