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.d/snippets/python-mode/shebang

@@ -0,0 +1,6 @@
+# -*- mode: snippet -*-
+# name: shebang
+# key: shb
+# --
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-