Create a web sandbox to demo nexss?

[jimallman]

It should be fairly easy to set up a server-side ETE with a minimal webserver, so that a user can browse to the sandbox page, edit nexss and nexml side by side, and get the resulting tree image. This would quickly demonstrate its capabilities and limitations.

Lots of precedents for this on the web, like the Vega editor, this simple HTML sandbox, etc.