chore(users): grfn -> aspen

Change-Id: I6c6847fac56f0a9a1a2209792e00a3aec5e672b9
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10809
Autosubmit: aspen <root@gws.fyi>
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
Reviewed-by: lukegb <lukegb@tvl.fyi>

users/aspen/xanthous/shell.nix

@@ -0,0 +1,23 @@
+let
+  depot = import ../../../. { };
+  inherit (depot) third_party;
+  pkgs = third_party.nixpkgs;
+in
+
+(pkgs.haskell.packages.ghc8107.extend (pkgs.haskell.lib.packageSourceOverrides {
+  xanthous = third_party.gitignoreSource ./.;
+})).shellFor {
+  packages = p: [ p.xanthous ];
+  withHoogle = true;
+  doBenchmark = true;
+  buildInputs = (with pkgs.haskell.packages.ghc8107; [
+    cabal-install
+    ghc-prof-flamegraph
+    hp2pretty
+    hlint
+    haskell-language-server
+    cabal2nix
+  ]) ++ (with pkgs; [
+    qpdf
+  ]);
+}