Specifying dates for blog posts

[Andygol]

Description

This PR introduces changes to the recommendations for placing blog posts in subfolders according to year. This will make it easier to organise blog posts in the future. More specific requirements have also been added regarding how to indicate (or not indicate) the date for draft posts.

RE PR #53736

Issue

Closes: #53735

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[lmktfy]

Thanks.

However, I would not want to merge this as is / without more planning:

• avoid reformatting the parts of the page you don't change
• we should combine this with a cut over plan about when the blog team will cut over to this new way of working

[lmktfy]

/hold

OK to unhold at any time, but I think this should merge at the same time as PR #53902 (or an equivalent update).

[Andygol]

It seems that PR #53902 uses a slightly different approach to naming files.

If the decision is made to use it as a basis, the text should be changed as follows

Suggested change

	In the GitHub repository, click the **Create new file** button. Name the file
	with the blog post in the format
	`/content/blog/en/blog/_posts/YYYY/YYYY-00-00-abbreviated-post-title.md`, where
	`…/YYYY/…` is the subfolder containing posts for the corresponding year, and
	`YYYY-00-00` is part of the file name until the publication date is determined,
	after which it will be replaced with the specific publication date. In case you
	need to add additional images, charts, etc. to your blog post, create a folder
	`/content/blog/en/blog/_posts/YYYY/YYYY-00-00-abbreviated-post-title/` with the
	file `_index.md` and additional files for your post.
	In the GitHub repository, click the **Create new file** button. Name the file
	with the blog post in the format
	`/content/blog/en/blog/_posts/YYYY/abbreviated-post-title.md`, where
	`…/YYYY/…` is the subfolder containing posts for the corresponding year. In case you
	need to add additional images, charts, etc. to your blog post, create a folder
	`/content/blog/en/blog/_posts/YYYY/abbreviated-post-title/` with the
	file `_index.md` and additional files for your post.

[lmktfy]

I think we should match how the other PR does it, and then that will also match with how the contributor site does it.

See https://github.com/kubernetes/contributor-site/tree/b09fbcbe3b84572be247f53386099eba86fa1c19/content/en/blog/2025 for an example.