If you are looking for a dashboard system that is written in vanilla JS, I will be open sourcing my DevBoard in the next month or two. You can see it in action at https://devboard.gitsense.com/microsoft/vscode and learn more about the widget system at https://devboard.gitsense.com/microsoft/vscode?board=gitsens... Note the repo that is mentioned in the intro page hasn't been pushed to GitHub yet, but will be soon.

The server is a very simple node/express app and the front end is written in vanilla javascript. I also use GitHub's primer css (https://github.com/primer/css) and a heavily stripped down version of tabler's css (https://github.com/tabler/tabler)

Note, DevBoard is more geared towards hackers, so Tremor's is probably a much better fit if you are looking for an out of the box solution.