Cannot register on Discourse

The https://discourse.appimage.org/signup address has a bug where the endpoint just replies with 403 and the page is stuck on "
Checking username availability… ".

https://discourse.appimage.org/u/check_username?username=whatever&email=test%40example.com

```json
{"errors":["You are not permitted to view the requested resource."],"error_type":"invalid_access"}
```

EDIT:
```js
require("discourse/models/user").default.checkUsername = async function () {
console.log("FAKING User.checkUsername()");
return {
available: true,
suggestion: null,
is_developer: false,
};
};
```
If I force enable it I get
```json
{"success":false,"message":"New account registrations are not allowed at this time."}
```

That REALLY could have been written more plainly.