add template links to stage1a intro and use FileTree

src/content/docs/learning-course/stage1/stage1a/stage-overview.mdx

@@ -5,33 +5,43 @@ prev: ../stage-overview
 next: false
 ---
 
+import { FileTree } from '@astrojs/starlight/components';
 import YouTube from '../../../../../components/YouTube.astro';
 
+Welcome to Stage 1A!
+Before we can start programming, we have to fork and clone the relevant repository:
+
+- If your team primarily uses REV electronics (such as Spark MAX motor controllers), clone [the REV template](https://github.com/frcsoftware/Stage1-Template-REV).
+- If your team primarily uses CTRE electronics (such as Kraken motors), clone [the CTRE template](https://github.com/frcsoftware/Stage1-Template-CTRE).
+
+<Aside type="tip">
+    If you forgot how to fork and clone a repository, read over [the Forking and
+    Cloning guide](/learning-course/getting-started/forking-and-cloning/).
+</Aside>
+
 Now, before we get into the depths of the robot code, it's useful to look at a high-level overview of the contents of a
 typical WPILib project.
 As your code gets more advanced, you'll see more folders and files appear, but they're all controlled
 by the same basic components.
-Below, you can see the sample file structure you'll be starting off with as a template for Stage 1A.
-If your robot has REV electronics, then the template folder's name will be `rev/` instead of `ctre/`
 
 ### Stage 1A Template Structure
 
-{/* rli:ignore */}
-
-```text
-ctre/
-├── src/main/
-|   ├── java/first/
-|   |   ├── robot/
-|   |   |   ├── opmode/
-|   |   |   |   ├── MyAuto.java
-|   |   |   |   ├── MyTeleop.Java
-|   |   |   ├── simulation/
-|   |   |   |   ├── DrivetrainSim.Java
-|   |   |   |   ├── SingleFlywheelSim.java
-|   |   |   ├── Robot.java
-|   |   ├── Main.java
-```
+{/* prettier-ignore */}
+<FileTree>
+- src
+    - main
+        - java
+            - first
+                - robot
+                    - opmode
+                        - MyAuto.java
+                        - MyTeleop.java
+                    - simulation
+                        - DrivetrainSim.java
+                        - SingleFlywheelSim.java
+                    - Robot.java
+                - Main.java
+</FileTree>
 
 You'll notice that we're skipping a lot of files here, because you don't have to edit those.
 What's great about using a framework like WPILib is that it automatically generates these files when you create a new project, so you can get started coding quicker.