fix(rust): remove bacon and rustAnalyzerPackage

`rustAnalyzerPackage` was removed and I never got around to properly
using `bacon`, so might as well save on space.

modules/hm/dev.nix

@@ -17,17 +17,6 @@ in
       [
         (lib.mkIf cfg.rust.enable {
           home.packages = [ pkgs.rustup ] ++ cfg.rust.extraPackages;
-          # Background code checker (for Rust)
-          programs.bacon = {
-            enable = true;
-            settings = {
-              export = {
-                enabled = true;
-                path = ".bacon-locations";
-                line_format = "{kind} {path}:{line}:{column} {message}";
-              };
-            };
-          };
         })
         {
           home = {

modules/nixvim/dev-plugins.nix

@@ -158,19 +158,7 @@ in
         };
       }
       # Rust plugins
-      {
+      { plugins.rustaceanvim.enable = true; }
-        plugins = {
-          bacon = {
-            enable = true;
-            settings.quickfix.enabled = true;
-          };
-          rustaceanvim = {
-            enable = true;
-            # Install through rustup
-            rustAnalyzerPackage = null;
-          };
-        };
-      }
       # Other plugins
       {
         plugins = {