I am running into the common Your site is having problems building: The symbolic link /blue.css targets a file which does not exist within your site’s repository.
I know this is a common issue and have read the linked documentation carefully. The issue is that the symlink it is referring to in the repo at https://github.com/activescott/blogs.pingpoet.com/blob/master/docs/blue.css and the linked target is indeed in the repository. In fact, if you hit that link from the github pages published site at http://blogs.pingpoet.com/blue.css, it even works!
Am I missing something?