DEV: Update internal `package.json` metadata (#17978)

These packages are not published anywhere - they only exist for organizational purposes within this repository. Even so, it makes sense for their metadata to match that of the top-level discourse/discourse repository.

app/assets/javascripts/discourse/package.json

@@ -2,10 +2,10 @@
   "name": "discourse",
   "version": "0.0.0",
   "private": true,
-  "description": "Small description for discourse-frontend goes here",
+  "description": "A platform for community discussion. Free, open, simple.",
   "repository": "",
-  "license": "MIT",
-  "author": "",
+  "license": "GPL-2.0-only",
+  "author": "Discourse",
   "directories": {
     "doc": "doc",
     "test": "tests"

app/assets/javascripts/wizard/package.json

@@ -3,7 +3,7 @@
   "version": "1.0.0",
   "description": "Discourse's setup wizard",
   "author": "Discourse",
-  "license": "MIT",
+  "license": "GPL-2.0-only",
   "keywords": [
     "ember-addon"
   ],