Support for stable Micropub extension 'Post Status'

[MaybeThisIsRu]

Link to Micropub Extension 'Post Status'. Discussion on the extension can be found here. It is stable as of June 2020.

This would aid users in writing articles that are long form and are written over the course of several days, by letting them revisit the publish page and having them specify post-status=published whenever they're ready.

[paulrobertlloyd]

This has been implemented in the v0.1.x branch.

By default, for Jekyll and Hugo configs, Indiekit will use this value to output draft: true in the frontmatter if post-status=draft. This is the preferred value for Hugo. Jekyll recommends publishing to a special _drafts folder, which Indiekit does not support. While this behaviour might not be desirable for Jekyll, it may still be useful Jekyll-esque static site generators like Eleventy which can hide posts using this value.