Add directory based archetypes

[bep]

Currently, if you organize your content into bundles, you would have to do something like this to create new content with the archetype system:

hugo new post/my-post/index.md

This works as expected, but the added power of bundles with its resource handling (image processing etc.) is screaming for some better support in this department.

This issue suggests that we add support for complete directories below /archetypes. These will be used as a base to create a new bundle (or whatever).

Given this content:

archetypes
├── default.md
└── post-bundle
    ├── bio.md
    ├── images
    │   └── featured.jpg
    └── index.md

hugo new --kind post-bundle post/my-post

Will create a new folder in /content/post/my-post with the same set of files as in the post-bundle archetypes folder.

The handling is simple:

• We do nothing with the file- or directory names.
• We parse and execute the content files (md, asciidoc etc.) as Go templates (like we do today) to enable dynamic values.
• All other files (images etc.) are just copied.

The above example uses the --kind flag. This should also work without it, we just have to decide "who should win" on conflicts with the file based variant.

See https://discourse.gohugo.io/t/archetypal-bundles/11195

[github-actions]

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