URLs in d/control outdated

We currently have in d/control:

Homepage: https://source.puri.sm/Librem5/squeekboard
Vcs-Browser: https://source.puri.sm/pureos/squeekboard
Vcs-Git: https://source.puri.sm/pureos/squeekboard.git

The Homepage moved to GNOME and the VCSbits tohttps://source.puri.sm/Librem5/debs/squeekboard` (this repo)