Add rust search engines to firefox

Change-Id: I64e5cd6745f133b5e5ad36bd15d765415e08778c
Reviewed-on: https://git.clicks.codes/c/Chimera/NixFiles/+/511
Tested-by: Skyler Grey <minion@clicks.codes>
Reviewed-by: Samuel Shuert <coded@clicks.codes>
diff --git a/homes/x86_64-linux/minion@greylag/default.nix b/homes/x86_64-linux/minion@greylag/default.nix
index 229e172..52db52b 100644
--- a/homes/x86_64-linux/minion@greylag/default.nix
+++ b/homes/x86_64-linux/minion@greylag/default.nix
@@ -97,6 +97,8 @@
           "Home-Manager Options"
           "Noogle"
           "GitHub"
+          "Docs.rs"
+          "Crates.io"
           "Arch Wiki"
           "Gentoo Wiki"
         ];