docs: fix incorrectly generated api docs

Fixes #7287

The `api-samples` was incorrectly included in the generated docs since it
had a `.tsx` file included. Due to the `typedoc.json` exclude rule not
handling the case it was displayed. The `exclude` rule was updated to be
more generic and not publish any documentation for the directories:
- `dev-packages`
- `examples`
- `typings`

Signed-off-by: Vincent Fugnitto <vincent.fugnitto@ericsson.com>

configs/typedoc.json

@@ -11,7 +11,7 @@
   "external-modulemap": ".*\/packages\/([\\w\\-_]+)\/",
   "name": "Theia TypeDoc",
   "exclude": [
-    "**/+(dev-packages|examples|typings)/**/*.ts",
+    "**/+(dev-packages|examples|typings)/**/*",
     "**/*spec.ts"
   ]
 }