update filetree to show collections

src/content/docs/en/basics/project-structure.mdx

@@ -32,14 +32,20 @@ A common Astro project directory might look like this:
   - components/
     - Header.astro
     - Button.jsx
+  - content/
+      - config.ts
+      - posts/
+        - post1.md
+        - post2.md
+        - post3.md
   - layouts/
     - PostLayout.astro
   - pages/
     - posts/
-      - post1.md
-      - post2.md
-      - post3.md
-    - index.astro
+      - [post].astro
+    - about.astro
+    - **index.astro**
+    - rss.xml.js
   - styles/
     - global.css
 - astro.config.mjs
@@ -66,6 +72,14 @@ Some files (like Astro components) are not even sent to the browser as written b
 While this guide describes some popular conventions used in the Astro community, the only directories reserved by Astro are `src/pages/` and `src/content/`. You are free to rename and reorganize any other directories in a way that works best for you.
 :::
 
+### `src/pages`
+
+Pages routes are created for your site by adding [supported file types](/en/basics/astro-pages/#supported-page-files) to this directory.
+
+:::caution
+`src/pages` is a **required** sub-directory in your Astro project. Without it, your site will have no pages or routes!
+:::
+
 ### `src/components`
 
 **Components** are reusable units of code for your HTML pages. These could be [Astro components](/en/basics/astro-components/), or [UI framework components](/en/guides/framework-components/) like React or Vue.  It is common to group and organize all of your project components together in this folder.
@@ -74,22 +88,14 @@ This is a common convention in Astro projects, but it is not required. Feel free
 
 ### `src/content`
 
-The `src/content/` directory is reserved to store [content collections](/en/guides/content-collections/) and an optional collections configuration file. No other files are allowed inside this folder.
+The `src/content/` directory is reserved to store [content collections](/en/guides/content-collections/) and a configuration file. No other files are allowed inside this folder.
 
 ### `src/layouts`
 
 [Layouts](/en/basics/layouts/) are Astro components that define the UI structure shared by one or more [pages](/en/basics/astro-pages/).
 
 Just like `src/components`, this directory is a common convention but not required.
 
-### `src/pages`
-
-[Pages](/en/basics/astro-pages/) are a special kind of component used to create new pages on your site. A page can be an Astro component, or a Markdown file that represents some page of content for your site.
-
-:::caution
-`src/pages` is a **required** sub-directory in your Astro project. Without it, your site will have no pages or routes!
-:::
-
 ### `src/styles`
 
 It is a common convention to store your CSS or Sass files in a `src/styles` directory, but this is not required. As long as your styles live somewhere in the `src/` directory and are imported correctly, Astro will handle and optimize them.