Blank page if javascript is disabled

## Current behavior

Navigating to the landing page server with javascript disabled gives a blank page.

## Expected behavior

At a minimum, the landing page should include a `<noscript>` block with an error. For instance, the frontend uses this:
```
    <app-root>Loading...</app-root>
    <noscript>Please enable JavaScript to continue using this application.</noscript>
```

