feat: simplify duti config (remove Apple-blocked UTIs), add manual instructions

home/duti.nix

@@ -1,24 +0,0 @@
-{ pkgs, ... }: {
-  home.packages = [ pkgs.duti ];
-
-  xdg.configFile."duti/config".text = ''
-    # browser
-    com.google.Chrome public.html all
-    com.google.Chrome public.url all
-    com.google.Chrome public.xhtml all
-
-    # markdown viewer
-    MarkEdit net.daringfireball.markdown all
-    MarkEdit public.markdown all
-
-    # terminal
-    kitty public.shell-script all
-
-    # pdf
-    net.sourceforge.skim-app.skim com.adobe.pdf all
-
-    # mail
-    com.apple.mail public.email-message all
-  '';
-  # defaults applied via system.activationScripts.defaultApps in hosts/poppy/default.nix
-}