I very recently put some effort into tidying up my dotfiles, and have a brief writeup at https://chatwithsysop.com/blog/2022/12/31/dotfiles-cleanup (none of this was done with the academic rigor required to withstand a deconstruction by HN, it is just a log of one person's experience with a weekend project).

I chose to use yadm (http://yadm.io) for no particular reasons beyond that I found it first, and it seemed reasonable. It's more just a wrapper around putting GIT_DIR elsewhere.