Sunsetting the Google Analytics services

[jarrodmillman]

Per the discussion in #546, we are temporarily trying both google analytics and plausible. Once we decide whether to use google analytics or plausible, we will need to either:

Remove google analytics (see #549)

Remove the following files

layouts/_default/baseof.html
layouts/partials/meta.html

as well as this line

googleAnalytics: UA-162151853-1

in config.yaml.in.

Remove plausible analytics (see #546)

Remove

  plausible:
    dataDomain: numpy.org

from config.yaml.in and

## Analytics

A self-hosted version of [Plausible.io](https://plausible.io) is used to gather simple
and privacy-friendly analytics for the site. The dashboard can be accessed
[here](https://views.scientific-python.org/numpy.org).

from README.md.

Why use plausible?

The theme will only support plausible going forward, so using it will involve less customization for numpy.org. For more information, see https://plausible.io/vs-google-analytics.

[rgommers]

I don't think there's a real decision point here between the two. We know we want privacy-friendly data from Plausible, we just don't want a gap in data. As soon as Plausible is working well and we have similar quality data to what we now get from Google Analytics, then we can drop Google Analytics.

[rgommers]

Thanks for finishing this @jarrodmillman!

Now that we have switched to only Plausible, it would be good to post the current data of both Google Analytics and Plausible, so we have a data point showing how the visitor numbers compare. That way we can normalize future numbers, otherwise we're probably going to see them as a drop in visitor numbers.

Here is the Google Analytics data as of right now:

Now ~150,000 users/month vs. ~100,000 a year and a half ago (see #269 (comment)) seems about right. As noted in that discussion, the Cloudflare numbers are way higher, more like ~2,000,000/month.

[rgommers]

@jarrodmillman can you post what you're seeing from Plausible?