[myrloc]

Do you use GitHub? If so, Discussions are useful for this. Closest in proximity to your codebase, simple markdown formatting, trusted platform. I've had some success lately using it as a remote member of my team, primarily to document my thoughts and request feedback, which is to say it hasn't been very successful with most of the rest of the team together in an office. However, I would recommend it as a simple platform for discussion.