fix: templates are not copied automatically to projects

lib/bds/starter_templates.ex

@@ -1,62 +1,22 @@
 defmodule BDS.StarterTemplates do
   @moduledoc false
 
-  alias BDS.Frontmatter
   alias BDS.Projects
 
-  @top_level_templates [
-    %{file_name: "single-post.liquid", slug: "single-post", title: "Single Post", kind: :post},
-    %{file_name: "post-list.liquid", slug: "post-list", title: "Post List", kind: :list},
-    %{file_name: "not-found.liquid", slug: "not-found", title: "Not Found", kind: :not_found}
-  ]
-
-  def install(project) do
-    source_root = Path.join(Application.app_dir(:bds, "priv/starter_templates"), "templates")
-    target_root = Path.join(Projects.project_data_dir(project), "templates")
-
-    :ok = File.mkdir_p(target_root)
-
-    source_root
-    |> list_files()
-    |> Enum.each(fn source_path ->
-      relative_path = Path.relative_to(source_path, source_root)
-      target_path = Path.join(target_root, relative_path)
-      :ok = File.mkdir_p(Path.dirname(target_path))
-
-      unless File.exists?(target_path) do
-        case Enum.find(@top_level_templates, &(&1.file_name == relative_path)) do
-          nil ->
-            File.cp!(source_path, target_path)
-
-          template ->
-            body = File.read!(source_path)
-
-            File.write!(
-              target_path,
-              Frontmatter.serialize_document(
-                [
-                  {:id, Ecto.UUID.generate()},
-                  {:slug, template.slug},
-                  {:title, template.title},
-                  {:kind, template.kind},
-                  {:enabled, true},
-                  {:version, 1}
-                ],
-                body
-              )
-            )
-        end
-      end
-    end)
-
-    :ok
+  def root_path do
+    Path.join(Application.app_dir(:bds, "priv/starter_templates"), "templates")
   end
 
-  defp list_files(root) do
-    root
-    |> Path.join("**/*")
-    |> Path.wildcard(match_dot: true)
-    |> Enum.reject(&File.dir?/1)
-    |> Enum.sort()
+  def template_roots(project) do
+    [Path.join(Projects.project_data_dir(project), "templates"), root_path()]
+  end
+
+  def default_slug(:post), do: "single-post"
+  def default_slug(:list), do: "post-list"
+  def default_slug(:not_found), do: "not-found"
+  def default_slug(_kind), do: nil
+
+  def default_template?(kind, slug) when is_binary(slug) do
+    default_slug(kind) == slug
   end
 end