Multiple Emacs Configs & Org Code Block Cleanup

- Add emacs-profiles.el to define available configurations
- Add chemacs, personal emacs, doom emacs, and personal doom emacs config
  as submodules
- Remove extra blank line from startup.sh
- Remove leading spaces from code blocks in org documents

.emacs-profiles.el

@@ -0,0 +1,5 @@
+(
+  ("personal" . ((user-emacs-directory . "~/.config/personal-emacs")))
+  ("doom"     . ((user-emacs-directory . "~/.config/doom-emacs")
+                 (env . (("DOOMDIR"    . "~/.config/doom-emacs-config")))))
+)