Support Vim, Tmux, Emacs with Stow

After moving off of Meta, Dotfiles has a greater responsibility to
manage configs. Vim, Tmux, and Emacs are now within Stow's purview.

configs/shared/emacs/.emacs.d/snippets/emacs-lisp-mode/elisp-module-docs

@@ -0,0 +1,11 @@
+# -*- mode: snippet -*-
+# name: Elisp module docs
+# key: emd
+# --
+;;; `(-> (buffer-file-name) f-filename)` --- $2 -*- lexical-binding: t -*-
+;; Author: William Carroll <wpcarro@gmail.com>
+
+;;; Commentary:
+;; $3
+
+;;; Code: