Add Wikipedia page view analytics

[tjpalmer]

https://twitter.com/d0m96/status/1125463625097936897

[tjpalmer]

Wikipedia page views starting 2015/07/01 are available here:

https://wikimedia.org/api/rest_v1/#/Pageviews%20data

For example, here's Ada by month:

https://wikimedia.org/api/rest_v1/metrics/pageviews/per-article/en.wikipedia.org/all-access/user/Ada_%28programming_language%29/monthly/20150701/20200930

I've started gathering Wikipedia page names here:

https://github.com/tjpalmer/languish/blob/master/scripts/data/keys.csv

Could write a script to pull for those already defined and save to an efficient data file for merging into the common stats file.