[feature request] Interface to aggregate statistics from multiple tutorials

We could consider developing a small interface to plausible allowing trainers to easily select all of a specific user's tutorials, or just easily multi-select materials, and aggregate statistics for them. It probably would need an API key in a proxy, but, it would save time if they need to collect statistics for many tutorials. Additionally it should have a date selector.

xref @AnnaSyme's matrix message

> Question about Plausible page metrics - is it possible to log in and generate a report for a particular metric (e.g. 2023 page views) across a set of different tutorials?
> I was trying to get around the time-consuming part of re-entering custom data ranges, but I see what you mean with how you can change the URL for that once you have a date range set.