Try to improve gnus HTML handling

gnus.el

@@ -91,7 +91,8 @@
       gnus-use-cache t
       gnus-summary-thread-gathering-function #'gnus-gather-threads-by-subject
       gnus-thread-hide-subtree t
-      gnus-thread-ignore-subject t)
+      gnus-thread-ignore-subject t
+      gnus-html-frame-width fill-column)
 
 (when window-system
   (setq gnus-sum-thread-tree-indent "  ")
@@ -119,6 +120,10 @@
 (add-hook 'gnus-group-mode-hook #'hl-line-mode)
 (add-hook 'gnus-article-mode-hook #'acdw/reading-mode)
 
+;;; MIME types
+(setq mm-discouraged-alternatives '("text/html"
+                                    "text/richtext"))
+
 ;;; Sending mail
 (setq send-mail-function #'smtpmail-send-it
       message-send-mail-function #'smtpmail-send-it