feat: use template.visibleFiles to reduce repetition

Author: AriPerkkio

src/content/tutorial/vite-plugin/replace-plugin/meta.md

@@ -6,5 +6,7 @@ lessons:
   - transforming-source-code
   - summarize-replace-plugin
 title: Replace Plugin
-template: replace-plugin
+template:
+  name: replace-plugin
+  visibleFiles: ["/tutorial-example.js"]
 ---

src/content/tutorial/vite-plugin/replace-plugin/summarize-replace-plugin/_files/tutorial-example.js

@@ -2,6 +2,9 @@
 type: lesson
 title: Import plugin from file
 focus: /vite.config.ts
+template:
+  name: replace-plugin
+  visibleFiles: []
 ---
 
 # Vite Replace plugin