Exclude drafts from sitemap

[rayshan]

Reopening: #36

Use case: create "private posts" that can be shared for feedback via a public link. Use Jekyll's show_drafts config flag to render drafts in production, and exclude them in post listing / feed / sitemap.

jekyll-feed added support for this a while back: jekyll/jekyll-feed#95

Current workaround is to use sitemap: false in front matter, but it's error-prone because one must remember to remove this flag in addition to moving the draft file.

[jekyllbot]

This issue has been automatically marked as stale because it has not been commented on for at least two months.

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