This is cool, I have been working with something in a similar vein (https://github.com/wlach/idr-tools), though it seems like you emphasize keeping a decision log more than I do. For me, that aspect has been a lot less useful than structuring my thoughts about how implementation should proceed. It probably depends a lot on what you're trying to do.
This might be my bias, but I feel like the site doesn't really immediately answer the question of why I would want to use these? What nagging issue does it solve? Some real world examples and case studies would go a long way to answering those questions. The theoretical stuff (papers, prior art, etc.) looks interesting but IMO does not belong on the front page.