[markdown] fontify code blocks natively: on by default

CHANGELOG.develop

@@ -2616,6 +2616,8 @@ files (thanks to Daniel Nicolai)
 - Improvements:
   - Evilfied =dap= debug windows
 **** Markdown
+- Fontify code blocks natively by default, for parity with the Org layer (thanks
+  to Keith Pinson)
 - Disable =mmm-mode= in Git commit buffers, in order to allow the use of Markdown
   mode when committing (thanks to Keith Pinson)
 - New layer variable =markdown-mmm-auto-modes= which is a list of language names

layers/+lang/markdown/packages.el

@@ -62,6 +62,9 @@
     :defer t
     :config
     (progn
+      ;; Make markdown-mode behave a bit more like org w.r.t. code blocks i.e.
+      ;; use proper syntax highlighting
+      (setq markdown-fontify-code-blocks-natively t)
       ;; Declare prefixes and bind keys
       (dolist (prefix '(("mc" . "markdown/command")
                         ("mh" . "markdown/header")