refactor!: restructure Doom core

BREAKING CHANGE: This restructures the project in preparation for Doom
to be split into two repos. Users that have reconfigured Doom's CLI
stand a good chance of seeing breakage, especially if they've referred
to any core-* feature, e.g.

  (after! core-cli-ci ...)

To fix it, simply s/core-/doom-/, i.e.

  (after! doom-cli-ci ...)

What this commit specifically changes is:
- Renames all core features from core-* to doom-*
- Moves core/core-* -> lisp/doom-*
- Moves core/autoloads/* -> lisp/lib/*
- Moves core/templates -> templates/

Ref: #4273

lisp/cli/info.el

@@ -0,0 +1,34 @@
+;;; lisp/cli/info.el --- information about your Doom install -*- lexical-binding: t; -*-
+;;; Commentary:
+;;; Code:
+
+;;
+;;; Variables
+
+;; None yet!
+
+
+;;
+;;; Commands
+
+(defcli! info
+    ((format ("--lisp" "--json") "What format to dump info into")
+     &context context)
+  "Print detailed information about your config for bug reports."
+  (with-temp-buffer
+    (pcase format
+      ("--json"
+       (require 'json)
+       (insert (json-encode (doom-info)))
+       (json-pretty-print-buffer))
+      ("--lisp"
+       (pp (doom-info)))
+      (_
+       (insert (doom-info-string
+                (if (doom-cli-context-pipe-p context :out t)
+                    72
+                  (doom-cli-context-width context))))))
+    (print! "%s" (string-trim-right (buffer-string)))))
+
+(provide 'doom-cli-info)
+;;; info.el ends here