Managed by stow.
Run script/bootstrap.sh. This will install brew (if it's not found) and proceed to install all packages, along with switching over to fish shell.
It should also run the Neovim first time setup and fetch all of the plugins for you automatically. Once done you can execute the sync fish function to update brew and the Neovim plugins.
Mainly based on fantastic work done by Olical/dotfiles. Thank you!