[docs] Update screenshots of sidebar in dashboard pages

[gadenbuie]

As pointed out in #798 (comment) the left gutter is not quite right. We need to create new screenshots before release.

https://rstudio.github.io/bslib/articles/dashboards/index.html

[cpsievert]

Generation of these screenshots are automated (at least they should be?), and I'm sure #814 will fix this

[github-actions]

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