Massive configuration overhaul

Currently paying the price of months of non-diligent git usage.

Here's what has changed.

- Theming support in Gvcci and wpgtk
- Dropping support for i3
- Supporting EXWM
- Many Elisp modules
- Collapsed redundant directories in ./configs

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

@@ -1,11 +0,0 @@
-# -*- 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: