Small site changes

[Maden]

• When you peruse any of the download categories, you might now be able to see files from their subcategories without having to visit each one directly (main Downloads page excluded)
• Created the Articled drop-down menu in the top menu and moved some articles in there
• Related to the point above, we now have an article for a Touhou Link List (github link) so that you can find more Touhou through your source for all things Touhou
• Whatever else might have happened in over half a year of no one posting a site changelog