Include game version

[KockaAdmiralac]

It is useful to know which version of the game is the code dump for. We could either include that information in the box with the credits (which means we regenerate all the pages on the site upon version bump) or only include it in the index page.

This version should either replace or supplement the existent search index cache version, because we want to bust the search index cache in people's browsers whenever we update the code dump versions.