Merge remote-tracking branch 'origin/index' into index

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diff --git a/emacs/.emacs.d/init/oni-shr-init.org b/emacs/.emacs.d/init/oni-shr-init.org
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+#+TITLE: shr configuration
+
+#+BEGIN_SRC emacs-lisp
+  (require 'shr)
+#+END_SRC
+
+* Remove background colors
+
+  Define a procedure that removes the last argument it gets if there
+  are more than 3.
+
+  #+BEGIN_SRC emacs-lisp
+    (defun oni:shr-colorize-remove-last-arg (args)
+      "If ARGS has more than 3 items, remove the last one."
+      (if (> (length args) 3)
+          (butlast args)
+        args))
+  #+END_SRC
+
+  Add the function as a filter-args advice to
+  =shr-colorize-region=. The last (fourth) argument to that function
+  is the background color to use, it's optional, so removing it
+  effectively stops shr from adding background colors.
+
+  #+BEGIN_SRC emacs-lisp
+    (advice-add #'shr-colorize-region :filter-args
+                #'oni:shr-colorize-remove-last-arg)
+  #+END_SRC