Add Hasklig pretty-code configuration

Took the list of symbols from
https://github.com/minad/hasklig-mode/blob/master/hasklig-mode.el ,
only rudimentary testings has been done on this

modules/ui/pretty-code/config.el

@@ -4,6 +4,8 @@
        (load! "+fira"))
       ((featurep! +iosevka)
        (load! "+iosevka"))
+      ((featurep! +hasklig)
+       (load! "+hasklig"))
       ((featurep! +pragmata-pro)
        (load! "+pragmata-pro")))