Allows wiki to have subfolders

[svallory]

Making the docId a catch-all parameter allows the wiki to have subfolders.

[svallory]

I'm not showing the title in the Doc.cshtml view. But if one wants to show it, it will probably have to overwrite the MarkdownService class (or overwrite the generated document's title) to either replace the slashes by something else or to strip the folders.