Feature request: filter out mirrors data (maybe even by default)?

**Is your feature request related to a problem? Please describe.**

For packages that are not downloaded much, most downloads come from mirrors and not `pip` or `uv` installs. This can give a wrong picture when looking at the numbers themselves or the timeseries of number of downloads per month. For example for skore `pip` and `uv` downloads are roughly 30% (i.e. roughly 70% are from mirrors or other installer types), see https://github.com/hugovk/top-pypi-packages/pull/41#issuecomment-2771919920 for more details.

pypistats.org filters out mirrors data from their aggregated numbers, see [their FAQ](https://pypistats.org/faqs#why-disregard-mirrors-from-aggregate-data).

**Describe the solution you'd like**
Maybe:
- a check box in the project dashboard to only take into account `pip` and `uv` installers (maybe a few others not 100% sure but those are the main 2 I would say) and exclude the rest
- or by default downloads from mirrors are excluded and a check-box to add them (this would be my preferred option but more disruptive)

**Describe alternatives you've considered**
Keep the status quo, numbers are higher, which you know for vanity metrics may be considered as a good thing 😜.

**Additional context**