[Idea] Add a portal to subpages in the wiki

[CloneWith]

This is to provide a more convenience interface for readers, since navigating using the sidebar links is better than going back and forward in experience. For example, when viewing Game modifier / Half Time (mod), a user may hope to read Easy (mod) (The article of the same position in the wiki directory), Game Modifier (The main article), or even articles with the same tag.