Add subheadings to lisp stuff

config.org

@@ -178,12 +178,14 @@ needs to be set up to install them if they aren't already.
 
 ** Lisps
 
+*** Racket
    Get =racket-mode= for some Racket-specific things, like searching documentation
 
    #+begin_src emacs-lisp
      (use-package racket-mode)
    #+end_src
 
+*** Common Lisp
    Use SLIME and Quicklisp for Common Lisp (SBCL), with a convenient
    binding for =slime-selector=
 
@@ -194,6 +196,7 @@ needs to be set up to install them if they aren't already.
      (load (expand-file-name "~/quicklisp/slime-helper.el"))
    #+end_src
 
+*** Paredit
    =paredit= is generally very useful for balancing parenthesis so we
    want that turned on for all the lisps. Additionally, it's nice to have
    an entire expression highlighted when the cursor is on one of its