Why? You can always use html2haml.
The site is perfect as it is, there's no need to add a unnecessary and non-standard format.
The site is perfect as it is, there's no need to add a unnecessary and non-standard format.
I used Haml in the past, and I understand it's popular nowadays mostly because of Rails, but I hardly think it's widely-used. Just to name a few that use HTML or a template engine of their own: Blogspot, Tumblr and Wordpress, and these are much more widely-used than Haml.
Consider the audience of Bootstrap when you talk about usage numbers. I'd wager the number of people using Bootstrap + haml (either through Rails or standalone) in their apps outnumbers the ones using Bootstrap + Wordpress/Blogspot/Tumblr.