feat: simplify flake-parts imports

flake/templates.nix

@@ -0,0 +1,26 @@
+{ self, ... }:
+{
+  flake = _: {
+    templates =
+      let
+        mkTemplates = names: builtins.listToAttrs (map
+          (name: {
+            inherit name;
+            value = {
+              path = "${self}/files/templates/${name}";
+              description = "${name} project ";
+            };
+          })
+          names);
+        templateNames = [
+          "python"
+          "rust"
+          "go"
+          "cpp"
+          "latex"
+          "default"
+        ];
+      in
+      mkTemplates templateNames;
+  };
+}