feat(glittershark): Get everything working on Darwin

Update everything in home-manager to properly work on darwin (including
adding dobharchu as a top-level attribute from
//users/glittershark/home) and also fix font faces and sizes in emacs
config

Change-Id: Ica889dd212876030d5c2a916a71d8b614e6964f1
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2147
Reviewed-by: glittershark <grfn@gws.fyi>
Tested-by: BuildkiteCI

users/glittershark/system/home/modules/games.nix

@@ -47,12 +47,12 @@ in mkMerge [
   {
     home.packages = [
       crawl
-      multimc
     ];
   }
   (mkIf stdenv.isLinux {
     home.packages = [
       df
+      multimc
     ];
   })
 ]