Remove VS Code extension from the main repository so it can live in a…

… dedicated space. See #473. (#476)

## What?

Removes the VS Code extension from the main WordPress playground
repository so it can live in a dedicated space.

As outlined in #473, WordPress Playground is re-focusing on [the
vision](WordPress/wordpress-playground#472)
and separating the framework from the applications.

Once the code removed by this PR is committed to a separate repo, a link
will be added to this PR.

.vscode/launch.json

@@ -4,15 +4,6 @@
     // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
     "version": "0.2.0",
     "configurations": [
-        {
-            "name": "Debug Playground for VS Code",
-            "type": "extensionHost",
-            "request": "launch",
-            "args": [
-                "--extensionDevelopmentPath=${workspaceFolder}/dist/packages/vscode-extension"
-            ],
-            "preLaunchTask": "build-vscode-extension"
-        },
         {
           "name": "Heap Profiler",
           "type": "node",

.vscode/tasks.json

@@ -1,14 +1,6 @@
 // BEGIN: 3f7a8b3d9b3c
 {
     "version": "2.0.0",
-    "tasks": [
-        {
-            "type": "npm",
-            "group": "build:vscode-extension",
-            "label": "build-vscode-extension",
-            "script": "build:vscode-extension",
-            "problemMatcher": "$esbuild-watch"
-        }
-    ]
+    "tasks": []
 }
 // END: 3f7a8b3d9b3c