The missing pages were removed intentionally. After clicking on the red links, the revision history is still visible. The last revision of the Atos page was just a blank template, so there's nothing to recover. WiPs are supposed to go in the 'WiP' namespace. It's a rule that gets broken a lot (I overlooked it, too), but it's still one of the basic rules.
You can see the latest revision of the Gamma Ray Laser page,
here. You can move what you've got to the WiP namespace. It might help to give it a more descriptive title. Other ships and factions might have gamma ray lasers too, after all, and the page doesn't have much to say about gamma ray lasers in general.
If you're making one page for a whole series of weapons, you could title it something like the 'Foobar Star Navy GRL-ABC Series' and separate the stats for the different size classes of weapon with slashes, like SDR 2/3/4 for the small, medium, and large versions, for instance. That's not the format, but it might be more convenient than having multiple pages, especially while still working on the project.