feat(gs/home): Add script to graphviz the clipboard

Add a script (to PATH, so I can launch it from rofi) to take whatever's
in the clipboard, pass it through `dot -Tpng`, and then open the result
with feh.

Change-Id: I1842fca3585a33d902da20dfa6101d1c6d2f2062
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3160
Reviewed-by: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI

users/grfn/system/home/machines/yeren.nix

@@ -8,6 +8,7 @@ in
   imports = [
     ../platforms/linux.nix
     ../modules/common.nix
+    ../modules/development/readyset.nix
   ];
 
   # for when hacking

users/grfn/system/home/modules/development/readyset.nix

@@ -0,0 +1,12 @@
+{ config, lib, pkgs, ... }:
+
+{
+  imports = [
+    ./rust.nix
+  ];
+
+  home.packages = with pkgs; [
+    # This goes in $PATH so I can run it from rofi and parent to my WM
+    (writeShellScriptBin "dotclip" "xclip -out -selection clipboard | dot -Tpng | feh -")
+  ];
+}