refactor: Reduce init time }:)

- Greatly increase gc-cons-threshold.  This is the biggest win of this commit, shaving off about 400 ms.  The GC runs a single time during init.
- Sprinkle a few `:defer t`s throughout.

wwwwfeat: Configure Orderless

users/crumb/programs/emacs/early-init.el

@@ -2,3 +2,10 @@
 
 ;; Disable package.el; we use Straight.
 (setq package-enable-at-startup nil)
+
+;; Enable use-package statistics for the sake of start-up profiling.
+(setq use-package-compute-statistics t)
+
+(setq gc-cons-threshold
+      ;; (4 gibibytes)
+      (* 4 (expt 1024 3)))