Updated wiki about identi.ca/twitter etc accounts

[Laura Arjona Reina <larjona99@gmail.com>]

Hi all
I have updated the wiki, splitting the information about social network
accounts in two pages:

Before it was:
https://wiki.debian.org/Teams/Publicity/Identica
Which included info about identi.ca (microblogging) and list of people
with identi.ca/twitter account.

Now it is
1.-
https://wiki.debian.org/Teams/Publicity/Identica
Which shows info about the official Debian identi.ca (pump.io) account,
and the list of people/teams having account there.

2.-
https://wiki.debian.org/Teams/Publicity/otherSN
Which shows info about the non official Debian accounts and groups in
the GNU Social fediverse (former StatusNet) and Twitter. And the list of
people/teams having accounts there.

I have removed the identi.ca accounts not existing now (they were
removed in the migration StatusNet > Pump.io due to more than 1 year of
inactivity).

I hope you like it like this, if not, feel free to reorganize the info
as you wish.

Regards
Laura Arjona