feat: use template.visibleFiles to reduce repetition

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

@@ -7,5 +7,7 @@ lessons:
   - env-variables-in-load-hook
   - summarize-env-plugin
 title: Env Plugin
-template: env-plugin
+template:
+  name: env-plugin
+  visibleFiles: [index.js]
 ---

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/transforming-code/content.md

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

src/content/tutorial/vite-plugin/yaml-plugin/defining-custom-plugin/content.md

@@ -2,6 +2,9 @@
 type: lesson
 title: Defining a custom plugin
 focus: /vite.config.ts
+template:
+  name: default
+  visibleFiles: ["/content.yaml", "/index.js", "vite.config.ts"]
 ---
 
 # Defining a custom plugin

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

@@ -7,4 +7,7 @@ lessons:
   - processing-yaml-files
   - summarize-yaml-plugin
 title: YAML Plugin
+template:
+  name: default
+  visibleFiles: ["/content.yaml", "/index.js"]
 ---