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/.ssh/config

@@ -0,0 +1,21 @@
+# Google work station
+Host desktop
+  Hostname wpcarro.lon.corp.google.com
+
+# Google cloud instance
+Host cloudtop
+  Hostname wpcarro.c.googlers.com
+
+Host gcp
+  User wpcarro
+  Hostname 35.246.93.73
+
+# Raspberry Pi home computer
+# router_public_ip: 150.143.40.77
+# private_ip: 192.168.1.67
+Host rpi
+  User pi
+  Hostname 150.143.40.77
+
+Match host *.corp.google.com
+  ProxyCommand corp-ssh-helper %h %p