Add org elpa archive + update lang/org #327

Now that the org ELPA archive has https support, we can add it to
package-archives. This fixes some 'org is unavailable' errors when
installing org packages that have declared earlier versions of org as
a dependency.

This also makes installing a newer version of org-mode much simpler.
Woo!

core/core-packages.el

@@ -92,7 +92,8 @@ base by `doom!' and for calculating how many packages exist.")
       package-enable-at-startup nil
       package-archives
       '(("gnu"   . "https://elpa.gnu.org/packages/")
-        ("melpa" . "https://melpa.org/packages/"))
+        ("melpa" . "https://melpa.org/packages/")
+        ("org"   . "https://orgmode.org/elpa/"))
       ;; I omit Marmalade because its packages are manually submitted rather
       ;; than pulled, so packages are often out of date with upstream.
 

modules/lang/org/config.el

@@ -4,9 +4,10 @@
   "The directory where org files are kept.")
 
 ;; Ensure ELPA org is prioritized above built-in org.
-(when-let* ((path (locate-library "org" nil doom--package-load-path)))
-  (setq load-path (delete path load-path))
-  (push (file-name-directory path) load-path))
+(when-let* ((path (locate-library "org" nil doom--base-load-path)))
+  (setq load-path
+        (delete (substring (file-name-directory path) 0 -1)
+                load-path)))
 
 ;; Sub-modules
 (if (featurep! +attach)  (load! +attach))

modules/lang/org/packages.el

@@ -1,12 +1,8 @@
 ;; -*- no-byte-compile: t; -*-
 ;;; lang/org/packages.el
 
-(when (version< emacs-version "26.1")
-  ;; We want org 9.1.x, but the org packaged with Emacs 25.x and under is 8.x.
-  ;; The only secure (and reasonably trustworthy) source for this is via
-  ;; emacsmirror. Emacs 26+ comes with Org 9.1.4.
-  (package! org-plus-contrib
-    :recipe (:fetcher github :repo "emacsmirror/org" :files (:defaults "contrib/lisp/*.el"))))
+;; Installs a cutting-edge version of org-mode
+(package! org-plus-contrib)
 
 (package! org-bullets :recipe (:fetcher github :repo "hlissner/org-bullets"))
 (package! toc-org)