- Adds the `markdown-preview.nvim` plugin.
- Adds the two `vim-pandoc` and `vim-pandoc-syntax` for the support of
markdown syntax and for file conversions with pandoc.
- Sets basic options (max width of 79 chars).
- Restores the `.gitignore` rules of the kickstart.nvim project.
- Adds and configures the Nordic colorscheme plugin.
- Sets the English, French and German spelling.
- Adds the `mkdnflow` plugin to get notebook features.
Co-Authored-by: iGor milhit <igor@milhit.ch>