This is the root proto-page. The content of this form is ignored, but it's fields are inherited by all other pages. E.g., if you were to set
actions = [[show_content = "wiki.show_content_as_lua_code"]]
on this page, all pages would default to displaying their content as
if it was Lua code. (Note that any page that sets
its own value, and any pages that inherit from it, will continue to
work as they did before.) I.e., this page only affects the default
values. Handle with care.