> I cannot run ./bin/next, as it is looking for /gnu/store/...

Do you have the full backtrace?

I know there is an issue at the moment, it's looking for the wrong
/gnu/store/...-next-gtk-webkit.  I'm not sure what's wrong, I'll look into it.

> How do I change / to be .?

Documentation is being reworked, but generally it is very similar to Emacs.  If
you want bind a new key:

(define-key *global-map* (key ".") 'whatever-command-here)

-- 
Pierre Neidhardt
https://ambrevar.xyz/