Configurable self-hosted "personal dashboard"?

I would like to have a screen in my home displaying a summary of different information that is relevant to me, like weather forecast, bus/train times, news headlines, etc. I was planning to use a Raspberry Pi and either buy a screen to display the information or just show it on my TV. It could probably be as simple as serving a page with HTML and JavaScript and then displaying it in a full screen web browser.

I feel like this is probably something that a lot of people want so I am wondering if there is something out there already that can easily be extended with custom "widgets". Nextcloud actually has a dashboard that's a bit like this but ideally I'd like something that is standalone and easier to extend with my own widgets.

Anyone have any recommendations?