Based on jasonlong/architect-theme, similar to pages-themes/architect, with quick adaptations to use Bootstrap with navbar-fixed, improve printing style, and other minor updates by @brodybits (Christopher J. Brody aka Chris Brody).
Here is a sample website on raw.githack.com. Please note that the link is a development URL that is not meant for production.
If you'd like to use jasonlong/architect-theme with Jekyll, Pietro Menna has put together a package to make it easy. You can find it at https://github.com/pietromenna/jekyll-architect-theme
See also: pages-themes/architect, with CC0 license (public domain)
This work is licensed under a Creative Commons Attribution 4.0 International License, with some modifications from Bootstrap licensed under MIT license.