Add VSCode Chrome debugging support (#1088)

## What is this PR doing?

Adds support for debugging Playground using VSCode and Chrome.

## What problem is it solving?

It simplifies debugging of the Playground web version.

## How is the problem addressed?

By adding a VSCode configuration entry.

## Testing Instructions

- Checkout this branch
- Start Playground
- Open the project in VSCode
- Open the _Run and Debug_ tab
- Select _Launch Chrome_ and click Start Debugging
- Confirm that Chrome debugging works (it sometimes requires a reload)

![Screenshot 2024-03-06 at 10 34
49](https://github.com/WordPress/wordpress-playground/assets/1199991/13a534b5-47ea-458e-a0c9-d580a0b1043a)

.vscode/launch.json

@@ -4,6 +4,13 @@
     // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
     "version": "0.2.0",
     "configurations": [
+      {
+        "name": "Launch Chrome",
+        "request": "launch",
+        "type": "chrome",
+        "url": "http://localhost:5400/website-server/",
+        "webRoot": "${workspaceFolder}"
+      },
       {
         "name": "Test playground sync",
         "request": "launch",

packages/docs/site/docs/13-contributing/02-code.md

@@ -43,3 +43,18 @@ valet proxy playground.test http://localhost:5400 --secure
 ```
 
 Your dev server is now available via https://playground.test.
+
+## Debugging
+
+### Debugging with VSCode and Chrome
+
+Playground can be debugged using VSCode and Chrome. To do so, follow these steps:
+
+-   Open the project in VSCode
+-   Go to the _Run and Debug_ view (Ctrl+Shift+D)
+-   Select _Launch Chrome_ from the dropdown
+-   Click the green play button to start the debugger (F5)
+
+### Debugging PHP
+
+In the web version of Playground, you can see PHP errors in the browser console. PHP errors are also logged after every PHP request using `console.debug` in the browser console.