Add support for the "nathanaelkane/vim-indent-guides" plugin (#226)

The even and odd highlighting blocks using `nord1` and `nord2` (`nord3`
in terminal mode) to provide a subtle and non-disturbing style.

Note that the custom theme colors [1] are only applied when the
`indent_guides_auto_colors` variable has been set to `0`:

```vim
let g:indent_guides_auto_colors = 0
```

[1]: https://github.com/nathanaelkane/vim-indent-guides#setting-custom-indent-colors

Resolves GH-186

0 files changed, 0 insertions, 0 deletions