🚀 : Add statistics for users

[F041]

Create a subdomain, different than insights (that deals with visitors), that shows a page about users statistics. Eg. males, females, males active in the last 24 hours, chart about the most frequent mother tongue, languages in demand with too low offer, etc.
I guess it mostly involves connecting to the DB, then using pandas (if with python).

If not a priority, just release the API for the non privacy sensitive columns of the DB (so surely not the email address).

[xuelink]

Related w/ langx/langx#795