BuddyPress.org

If you want all of the directories to be underneath the community page, I would do exactly the same thing you just did to make the community page, and make members/groups/blogs directory pages. I’m not sure there’s a way to contain ALL of BuddyPress within a subdirectory, considering that your users and groups and blogs are all linked off of the root of the site, and not the root of a specific blog, subdomain, or subdirectory.