fix: PageList sorting date

[igor-sirotin]

Description

The sorting of folder items in the Weekly Updates folders was done by publishDate, but we have date (created date) in the documents, so the sorting is messed up, making the latest updates appear in the center of the page.

Fix

The fix is simple, we change the sorting from published to date.

It's not ideal, because I modified the original source code. But it is as a very straightforward singleliner, so I would go with it, rather than modifying 403 documents date fields.

This is similar to what Hugo was configured to do:

roadmap/config.toml

Lines 30 to 32 in 3dea943

	[frontmatter]
	lastmod = ["lastmod", ":git", "date", "publishDate"]
	publishDate = ["publishDate", "date"]