download: use sources.js instead of jinja static templates See http://mercurial.selenic.com/wiki/BinaryReleasePlan 1. [hg-website] update the main page (templates/base.html and static/js/download.js) to use sources.js as a dynamic binary release information source instead of using a jinja template maintained as part of the web site. templates/data no longer required; removed. 2. [hg-website-content] update the /downloads page use the sources.js information also. This changes some of the detection and package naming, naturally, but that likely must be addressed in latest.dat files or in the protocol for creating sources.js.