Discourse not loading on legacy browsers

IIRC this was essential for some browsers (IE < 10?) because it’s impossible to access <noscript> tags via JavaScript after doing the feature detection. I think @dan worked on this problem a few years back?

Note that there are two fallback ‘modes’ at the moment:

  1. Serve the crawler view. No JS required. This is gated on browser_update_user_agents.

  2. Serve the full app, feature detect, and fallback by moving <noscript> content into <body>. This is not based on user agent.

The problem here is that (2) is not working on mobile, because the server isn’t rendering any <noscript> content. We need to fix that, without breaking (1) for mega-old browsers.

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