Blank page if javascript is disabled

[sbliven]

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>

[sbliven]

Even better would be to enable server-side rendering to provide actual HTML content. However I haven't looked into how much effort that is or what side-effects this would have.