I noticed that Luanti and Mineclonia have an undocumented contentdb entry in their YAMLs. Intentional?
The website appears to render these links, but without an icon. It is also misspelled as "Contentdb" (instead of "ContentDB").
FYI: "ContentDB" is the name of the website/server that hosts games and mods for Luanti. It can be found here: https://content.luanti.org/