Revert "add GA tag"

[fgaz]

This reverts commit 95826df.

The use of Google Analytics has been declared unlawful in three EU countries already, with probably more to follow.
Keeping it there is a huge liability.

[andreasabel]

@gbaz: You introduced this feature 4 years ago in

• Add google-analytics #665 [ah, too bad, one short of 666]

with the justification:

It would be very good to have some objective data on browsing patterns, to see how people tend to use the site. This would really inform future discussions.

How is the data we collect (and share with Google) used now?

[gbaz]

It hasn't been used in some time. It was used to try to figure out what the patterns were for finding packages -- which pages were entry points, if people tended to search around more or use the old package listings page, etc. so that we could shorten the work people needed to do to find what they wanted.

[gbaz]

I discussed this with fgaz and at this point I think that the very marginal benefit we get out of GA or any other analytics package is not worth the hassle of increasing rulings that make doing such things confusing and difficult.