jest: ignore these directories when discover tests

We should only look for tests in our `www/__tests__` directory, not any other `__tests__` directories that may exist in dependencies or anywhere in the project directory tree.
Further, by explicitly ignoring these directories, we don't have to specify `npx jest www/__tests__`, and can simply run `npx jest`.

.github/workflows/serve-install.yml

@@ -59,7 +59,7 @@ jobs:
     - name: Run Jest tests
       shell: bash -l {0}
       run: |
-        npx jest www/__tests__
+        npx jest
 
 # TODO: figure out how to check that a server started correctly
 #    - name: Try starting it

jest.config.json

@@ -1,4 +1,11 @@
 {
+  "testPathIgnorePatterns": [
+    "/node_modules/",
+    "/platforms/",
+    "/plugins/",
+    "/lib/",
+    "/manual_lib/"
+  ],
   "transform": {
     "^.+\\.(ts|tsx|js|jsx)$": "ts-jest"
   },

package.serve.json

@@ -11,7 +11,7 @@
     "setup-serve": "./bin/download_settings_controls.js && ./bin/setup_autodeploy.js",
     "serve": "webpack --config webpack.dev.js && concurrently -k \"phonegap --verbose serve\" \"webpack --config webpack.dev.js --watch\"",
     "serve-only": "phonegap --verbose serve",
-    "test": "npx jest www/__tests__"
+    "test": "npx jest"
   },
   "devDependencies": {
     "@babel/core": "^7.21.3",