only list significant popit instances on popit.mysoc
only list significant popit instances on popit.mysoc

Display standard list on other sites but hardcode a curated list on
popit.mysociety.org for speed.

Fixes #369

mysociety/popit,openstate/popit,Sinar/popit,openstate/popit,Sinar/popit,mysociety/popit,openstate/popit,openstate/popit,mysociety/popit,Sinar/popit,mysociety/popit,mysociety/popit,Sinar/popit