Check some doc update before 1.6 release

[cderv]

I just spotted in link to prerelease website in the changelog

quarto-cli/news/changelog-1.6.md

Line 5 in c96fe72

- The syntax for standard library imports in `quarto run` TypeScript files (`*.ts`) changed. Please see <https://prerelease.quarto.org/docs/projects/scripts.html#deno-scripts> for how to make the necessary changes.

I will probably be better to update this in main right before release, or right after we do make the website switch in 1.6