Slightly off topic, but do you find that docs really need to be mobile friendly? I'd personally rather the developer focuses on the actual project and all those concerns rather than a perfect responsive docs page. Esp when assuming most of these docs are eventually translated into markdown on github which are then mobile friendly.
I tend to do exploration on my phone when I have downtime while being out and about. Mobile friendly docs are a sure way to keep my attention on your project if I stumble upon it during these times.
Of course, I do plenty of research from my desktop as well, so if it's a choice between getting a new release out on time or having a perfect mobile experience, I'd suggest library authors prefer getting timely releases out myself.