There are already websites like Master How To Learn and SuperMemo Guru, the various guides on spaced repetition systems on the internet (including Andy Matuschak’s prompt-writing guide which is presented in the mnemonic medium), and books like Make It Stick. If I was working on such a project I would try to more clearly lay out what is missing from these existing resources.
My personal feeling is that enough popularization of learning techniques is already taking place (though one exception I can think of is to make SuperMemo-style incremental reading more accessible). So I would be much more interested in having people push the field forward (e.g. What contexts other than book learning can spaced repetition be embedded in? How do we write even better prompts, especially when sharing them with other people? Why are the people obsessed with learning not often visibly more impressive than people who don’t think about how to learn, and what can we do about that?).