Images are broken in dev mode

[rozbb]

Running scripts/dev.sh (which calls trunk) runs a version of RTMS with broken images, broken content scripts, broken manifests, etc. This is because dev mode serves the index from /, while production serves all the static assets from /assets/ (aside from index.html, which is special-cased). So if I set the favicon URL to /assets/favicon.ico, then it'll load in prod mode but fail in dev mode. And if I set it to /favicon.ico it'll load in dev mode and fail in prod mode.

An obvious thing to try is to put everything inside an /assets folder in dev mode. But this doesn't work because 1) it needs to serve index.html from /, and 2) if you make index.html separate, and put everything else in /assets/, then the URLs in prod will be /assets/assets/, because Trunk doesn't distinguish dev and prod builds.

Another solution is to do the above, but also make a copy of every asset in / as well. But 1) Trunk doesn't have a notion of making 2 copies of everything (though maybe you could do this in post-build hooks, and 2) this is very ugly.