A lot of it is specific to how my machine is set up -- in particular, using Nix to manage plugins -- and there is a lot of legacy bits that have accumulated over the years, including from when I used the original Vim.
If you're interested in how I do things, see:
I'm trying something a bit different with it.
Instead of a monolithic file, I've split the init bits over several files in init/ for organisation.
The init.lua simply runs them all in order.
For this, clone/symlink the repository to ~/.config/nvim.
Then run nix build to produce result, and symlink ~/.config/nvim/result/bin/vim (which is a wrapped neovim) into a folder in $PATH.
Neovim will read its configuration from the default location of ~/.config/nvim, and so the vimrc can be edited and loaded without needing to rebuild.
Changes to the wrapper, as well as changing plugins, will require a rebuild though.
I was also able to make a build in which bundles the vimrc into the nix build. This allows you to do fun Nix things, such as copying the closure to another system.
The trick I was most interested in was bundling everything into a single portable binary. To do this, run
nix bundle --bundler github:ralismark/nix-appimage .#freestanding
Which will produce nvim-x86_64.AppImage.
This produced binary runs completely standalone and can be copied onto other systems without Neovim or even Nix installed and runs with this vimrc.