Add photos

app/templates/photos/index.html.slim

@@ -0,0 +1,8 @@
+div class="mb-12 prose dark:prose-invert max-w-prose mx-auto text-gray-800 dark:text-gray-200"
+  h1 Photos
+
+div class="grid grid-cols-3 gap-4 mb-4 max-w-prose mx-auto"
+  - photos.each do |post|
+    == render :photo_post, post: post
+
+div class="max-w-screen-md mx-auto border-t-4 border-solid border-gray-400 dark:border-gray-600"