I feel I need to centralise them in some automated fashion to have a single place where people can find technical content both engineering and data science.
What matters is indexing (for search) + cataloging (for structured discovery) the contents + managing access to it (because not everyone may be entitled to it, sometimes even not to its existence).
You need a portal application/website that manages at least the 2 first, and always point your people to this portal first.
It may be overkill when you're a small structure, but as you grow, and as you need to have processes for more and more things, this becomes a time- and org-saver.
Because as you grow, and with time, you will inevitably face diverse teams having different preferences as to how manage/set/reform their own documentation. You don't want to block that, you want to keep track of it.
Separating the index/catalog of the documentation from its various sources helps you keep track and manage on one hand, and helps your whole teams to keep information available to all.
Could you make something that indexes these in (say) Elasticsearch?