Simplify gitlab ci

The elaborate gitlab ci setup was making it hard to know what was what, especially when gitlab-ci occasionally fails on its own. This removes the surge.sh setup since it made things a lot more complicated, and wasn't really working as we had hoped. Indeed for me it almost never worked. So now there is only gitlab pages deploys, and all branches deploy to gitlab pages. So which ever was the last branch to build successfully will be the one to show up on the fork's gitlab pages site. That makes it a bit more complicated for very active devs with multiple open merge requests, but a lot simpler for new and part time contributors.

This also adds a new translation validation script to check if translators mistakenly translated the links.