added lastmod date after slash in the post header if available.

[McAviti]

Pull Request type

Please check the type of change your PR introduces:

• [ ] Bug-fix
• [x] Feature (functionality, design, translations, etc.)
• [ ] Documentation change
• [ ] Project management (tests, CI, GitHub configuration, etc.)
• [ ] Other (please describe):

Current state

If a post has a last modified attribute ("lastmod"), this is not visible in the rendered article.

Issue Number(s):

Proposed changes

If a post has a "lastmod" metadata attribute is present, it is added after the creation date, separated by a slash.

Screenshots, if applicable

Checklist

• [x] Bug-fixes and new features: I have tested locally with the latest release of Hugo extended. This requirement is a standard.
• [x] Bug-fixes, new features, and doc changes: I have updated the relevant documentation as part of this PR.
• [x] All PRs: I have signed off (using git commit -s ...), or if not possible due to developer environment constraints, will comment below confirming that I am adhering to the Developer Certificate of Origin.

[onweru]

@McAviti,

Thanks for contributing. To show or not to show LastMod should be an opt-in feature; i.e disabled by default, with a variable in the config to turn it on.

Could you tweak this PR to satisfy that condition? If not, let me know I can help out .

[McAviti]

Sure @onweru , that's reasonable, I hope I got it right. I added $showLastmod as Param, and I additionally suggest a $lastmodSeparator Param to be able to override the default "/" I arbitrarily selected. What do you think of that? Please review.