feat: move all content to content dir

src/content/pages/posts.md

@@ -0,0 +1,10 @@
+---
+permalink: /posts/index.html
+layout: "base"
+---
+
+{% for post in collections.posts %}
+{{ post.fileSlug }}
+{% endfor %}
+
+Here are all my posts!

src/content/posts/posts.json

@@ -0,0 +1,5 @@
+{
+  "layout": "base",
+  "tags": "posts",
+  "permalink": "posts/{{ page.fileSlug }}/index.html"
+}

src/posts/posts.json

@@ -1,4 +0,0 @@
-{
-  "layout": "base",
-  "tags": "posts"
-}