wip: feat: Defer many packages

Shaving MILLISECONDS off our startup time!!!  Fuck yes!

I've measured the average startup time to be 0.68s in the previous commit, and an average of 0.52 with this commit.

README.org

@@ -95,6 +95,35 @@ On boot, ...
 
 sydnix-cli is a command-line utility written in Clojure wrapping various sydnix-related scripts.
 
+** Deferring Emacs packages
+
+Nearly all configuration of Emacs packages happens under the ~use-package~ macro. ~use-package~ has various keywords with special syntax for common tasks, such as instrumenting hooks, setting keybindings, and customising variables. You may be surprised to learn that these are not /just/ syntactic sugar }:) (I was).
+
+As an example, this
+
+#+begin_src emacs-lisp
+(use-package which-key
+  :hook (on-first-input . which-key-mode)
+  :custom
+  (which-key-allow-evil-operators t)
+  (which-key-show-operator-state-maps t)
+#+end_src
+
+is not the same as this
+
+#+begin_src emacs-lisp
+(use-package which-key
+  :config
+  (add-hook 'on-first-input #'which-key-mode)
+  (setq which-key-allow-evil-operators t)
+  (setq which-key-show-operator-state-maps t)
+#+end_src
+
+The difference connects to another silly obsession of the Emacs hacker: startup time. ~use-package~'s special keywords will /defer/ the loading of the package ([cite:@systemcrafters2021how]) . E.g., instead of loading ~which-key~ on startup, it will be loaded when the ~on-first-input~ hook is first called.
+
+~on-first-input~ is one of many useful hooks provided by the package [[https://github.com/emacsmirror/on][on.el]] specialised for fine-grained control of package loading.
+
+>>>>>>> Conflict 1 of 1 ends
 * Tasks
 
 ** Begin setting up doomless Emacs