Migrate co-op pages from old site

I ran `ruby migrate_coop_pages.rb` in `scripts`. There will need to be
some manual tidying up of the generated `.md` files under `_coops` but
I think this is a good start. As a one-off it doesn't warrant the time
it would take to improve the migration script.

_coops/digital-liberties.md

@@ -0,0 +1,27 @@
+---
+title: Digital Liberties
+name: Digital Liberties
+website: https://digital-liberties.coop
+email: 
+twitter: 
+github: 
+telephone: 07908 592 835
+address: 44 Arkwright Road,London,NW3 6BH
+latitude: 
+longitude: 
+clients:
+- labour-party
+- nesta
+services:
+- community-building
+- game-design
+- research
+- strategy
+technologies:
+---
+
+Cybernetic Games and Participatory Democracy
+Digital Liberties is a co-operative applying systems thinking to individual freedom and collective decision-making in the information age.
+The co-operative uses modelling to ensure that complex situations can be tackled in a realistic way that is understandable to the general public.
+This modelling allows us to generate flexible simulations which can be tested through games, allowing participants to fully understand the issues and also for flaws in the model to be detected.
+Our approach to democratic decision-making is rooted in developing a pragmatic approach to complex decisions using digital tools. This leads to better informed policies and practices in a wide variety of circumstances.