Move init.el to early-init.el

Our first step toward dropping 26.x support. Allows our optimizations to
reach a little further into the startup.

init.el

@@ -27,43 +27,11 @@
 ;;
 ;;; License: MIT
 
-(when (< emacs-major-version 26)
-  (error "Detected Emacs v%s. Doom only supports Emacs 26 and newer"
-         emacs-version))
-
-;; A big contributor to startup times is garbage collection. We up the gc
-;; threshold to temporarily prevent it from running, then reset it later by
-;; enabling `gcmh-mode'. Not resetting it will cause stuttering/freezes.
-(setq gc-cons-threshold most-positive-fixnum)
-
-;; In noninteractive sessions, prioritize non-byte-compiled source files to
-;; prevent the use of stale byte-code. Otherwise, it saves us a little IO time
-;; to skip the mtime checks on every *.elc file.
-(setq load-prefer-newer noninteractive)
-
-;; `file-name-handler-alist' is consulted on every `require', `load' and various
-;; path/io functions. You get a minor speed up by nooping this. However, this
-;; may cause problems on builds of Emacs where its site lisp files aren't
-;; byte-compiled and we're forced to load the *.el.gz files (e.g. on Alpine)
-(unless (daemonp)
-  (defvar doom--initial-file-name-handler-alist file-name-handler-alist)
-  (setq file-name-handler-alist nil)
-  ;; Restore `file-name-handler-alist' later, because it is needed for handling
-  ;; encrypted or compressed files, among other things.
-  (defun doom-reset-file-handler-alist-h ()
-    ;; Re-add rather than `setq', because changes to `file-name-handler-alist'
-    ;; since startup ought to be preserved.
-    (dolist (handler file-name-handler-alist)
-      (add-to-list 'doom--initial-file-name-handler-alist handler))
-    (setq file-name-handler-alist doom--initial-file-name-handler-alist))
-  (add-hook 'emacs-startup-hook #'doom-reset-file-handler-alist-h))
-
-;; Ensure Doom is running out of this file's directory
-(setq user-emacs-directory (file-name-directory load-file-name))
-
-;; Load the heart of Doom Emacs
-(load (concat user-emacs-directory "core/core")
-      nil 'nomessage)
+;; In the strange case that early-init.el wasn't loaded (e.g. you're using
+;; Chemacs 1? Or you're loading this file directly?), we do it explicitly:
+(unless (boundp 'doom-version)
+  (load (concat (file-name-directory load-file-name) "early-init")
+        nil t))
 
 ;; And let 'er rip!
 (doom-initialize)