feat(emacs): Eshell stuff

- Fancify prompt
  - Shows success of last command.
  - TRAMP prefix is made distinct.
  - CWD is abbreviated.
- cd to project root (`cdp`).
- Imitate using `C-d` / send-EOF to exit.
- Opening popup shell puts user in insert state.
- Fixes TRAMP customisation.

Nicely done! }:3

users/crumb/programs/emacs/modules/syd-evil.el

@@ -52,7 +52,12 @@
 
   ;; In imitation of Vim's :mes[sages] command, define an Evil analogue to show
   ;; the echo area.
-  (evil-ex-define-cmd "mes[sages]" #'view-echo-area-messages)
+  (defun syd-evil-messages ()
+    (interactive)
+    (view-echo-area-messages)
+     (with-current-buffer messages-buffer-name
+       (evil-motion-state 1)))
+  (evil-ex-define-cmd "mes[sages]" #'syd-evil-messages)
 
   ;; On ESC, remove highlighted search results.
   (defun syd-evil-nohl-h ()