Move lang/org => org/*

Since lang/org has grown (and is expected to grow much, much more), it
has been given its own module category.

Concerns #129, #138

init.example.el

@@ -90,7 +90,6 @@
        lua             ; one-based indices? one-based indices
        markdown        ; writing docs for people to ignore
        ocaml           ; an objective camel
-       org             ; for organized fearless leader (WIP)
        php             ; make php less awful to work with
        purescript      ; javascript, but functional
        python          ; beautiful is better than ugly
@@ -103,6 +102,17 @@
        typescript      ; javascript, but better
        web             ; the tubes
 
+       :org
+       org             ; organize your plain life in plain text
+       org-babel       ; executable code snippets in org-mode
+      ;org-attach      ; FIXME my own, simpler attachment system
+       org-capture     ; a better org-capture, in or outside of Emacs
+       org-export      ; a custom, centralized export system
+       org-notebook    ; org-mode as a notebook
+       org-present     ; using org-mode for presentations
+      ;org-sync        ; TODO sync with mobile
+      ;org-publish     ; TODO org + blogs
+
        ;; Applications are complex and opinionated modules that transform Emacs
        ;; toward a specific purpose. They should be loaded last.
        :app