xdg: Move xdg media directories

Moved all directories with media contents (pictures, videos, music) to a
single coherent media directory.

vifm/.config/vifm/vifmrc

@@ -118,8 +118,8 @@ set findprg='fd %A --hidden --exclude .git --exclude node_modules'
 mark h ~/
 mark d ~/downloads/
 mark p ~/projects/
-mark i ~/pictures/
-mark v ~/videos/
+mark i ~/media/pictures/
+mark v ~/media/videos/
 mark n ~/documents/notes/
 mark N ~/Nextcloud/
 mark l ~/documents/library/academia/pdf/