Expand ligature support

uno/modules/lang/+index.org

@@ -18,3 +18,26 @@ Define language package.
   (use-package json-mode
     :after uno-lang)
 #+END_SRC
+
+* Makefile
+
+#+BEGIN_SRC emacs-lisp
+  (use-package emacs
+    :after (uno-lang ligature make-mode)
+    :config
+    (ligature-set-ligatures 'makefile-mode '(":=" "?=")))
+#+END_SRC
+
+* XML
+
+#+BEGIN_SRC emacs-lisp
+  (use-package emacs
+    :after (uno-lang ligature nxml-mode)
+    :config
+    (ligature-set-ligatures 'nxml-mode '("<!--" "-->" "</" "/>")))
+
+  (use-package emacs
+    :after (uno-lang ligature sgml-mode)
+    :config
+    (ligature-set-ligatures 'sgml-mode '("<!--" "-->" "</" "/>")))
+#+END_SRC