Create new CSS for proxy error pages?

Since the bundling of the CSS in the wars, we now bundle an extra copy of the light and dark console css (350K total) in i2ptunnel.jar. It loads fairly slowly because it's served at the proxy.i2p domain, not localhost, so the browser has to load it again. I made a change to gzip it but that may not have made it any better.

It would load faster, and be a lot more maintainable, if we took just what we needed from the console css and created css just for the proxy. On the plus side, it would be easier to make changes to how the error pages looked. On the downside, if we wanted to continue to have the error pages be themed exactly like the console, it would increase the work.

Good idea or not?

cc @idk