Add support for nvim-treesitter/nvim-treesitter (#253)

Neovim version 0.5 [1] is a long-time awaited update that introduces
features like tree-sitter [2][3] support and native LSP [4][5].
Even though Neovim devides more and more from Vim through specific
features like first-class Lua support with custom APIs, the highlighting
for tree-sitter is achived through "normal" syntax highlighting groups.
Most of the groups are already linked by the nvim-treesitter plugin by
default [6] so only a few groups have been adjuated for now to fit the
Nord style.

[1]: https://github.com/neovim/neovim/releases/tag/v0.5.0
[2]: https://github.com/tree-sitter/tree-sitter
[3]: https://github.com/nvim-treesitter/nvim-treesitter
[4]: https://neovim.io/doc/user/lsp.html
[5]: https://github.com/neovim/nvim-lspconfig
[6]: https://github.com/nvim-treesitter/nvim-treesitter/blob/90f15d9/plugin/nvim-treesitter.vim

Co-authored-by: Ferran Jovell <ferran.jovell@gmail.com>
Co-authored-by: Arctic Ice Studio <development@arcticicestudio.com>
Co-authored-by: Sven Greb <development@svengreb.de>

Closes GH-235

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