Introduce Regions

[rgaudin]

Following kiwix/container-images#263, we've decided that we will be configuring mirrorbrain mostly via the regionOnly parameter.

In order to generate region-aware data, we need our Countries to be associated with regions.

We will use the Maxmind GeoIP Countries DB for that (because that's stable and because that's what MB is already using – albeit an older version)

Todo:

• Add region Table (code, name)
• Add region field in Country
• Write a script that given a GeoLite2-Country-Locations-en.csv file fills both the region table and updates the countries.

DB file can be downloaded from maxmind website (requires creating an account). What's most appropriate I believe is the GeoLite2 Country: CSV Format download and the GeoLite2-Country-Locations-en.csv inside it.