feat(language/markdown): enable polymode in markdown buffers

modules/languages/siren-markdown.el

@@ -12,6 +12,7 @@
 (require 'siren-move-dup)
 (require 'siren-prettier-js)
 (require 'siren-smartparens)
+(require 'siren-polymode)
 
 (use-package markdown-mode
   :mode
@@ -65,5 +66,8 @@
 (use-package edit-indirect
   :defer t)
 
+(use-package poly-markdown
+  :ensure t)
+
 (provide 'siren-markdown)
 ;;; siren-markdown.el ends here