I recommend watching (and listening to) this talk by Saqib Shaikh, a blind developer using Visual Studio and how we codes and debugs with his screen reader https://www.youtube.com/watch?v=94swlF55tVc
If you want something that doesn't require any other distractions (HTML, CSS etc) then Node.js is a good choice. How about writing a RESTful API or something else self-contained? A while ago I wrote a thing which tweets train delays in a few days https://github.com/dcrichards/gordon to try out some recent Node.js features and libraries.
Inclined to agree with this, I totally understand trying to maintain a standard of answers and being able to quantify expertise in some way to ensure quality content, but I feel like it can be more of a hinderance than a help. Reddit is a good example, although it's often littered with poor content, there's an overall high quality of discussion amongst more focussed threads and subreddits and those with expertise and knowledge to offer are for the most part respected and drive some good discussions.