This runtime package provides `.rnlt` file detection, syntax highlighting,
comment settings, and suffix lookup. Link it into Vim's native package path:
```sh
mkdir -p ~/.vim/pack/runlet/start
ln -s "$PWD/editors/vim" ~/.vim/pack/runlet/start/runlet
```
For Neovim:
```sh
mkdir -p ~/.local/share/nvim/site/pack/runlet/start
ln -s "$PWD/editors/vim" ~/.local/share/nvim/site/pack/runlet/start/runlet
```