Add an option like languages.<name>.enable to simplify LSP setup

[phucisstupid]

so users don’t need to search for the best LSP server themselves.

[MattSturgeon]

I don't think nixvim really wants to maintain a list of which lsp is best for which languages.

[phucisstupid]

If they build a large project like NixVim with tons of plugins, they can just maintain a simple curated list of the best LSP servers for each language.