Neovim language tooling

This section covers language/filetype behavior that is easy to miss when reading the config.

Slice	Owns
Parsers and filetypes	tree-sitter parser hygiene, bundled parsers, chezmoi template filetypes
LSP and source jumps	code actions, Rust analyzer, Lua LS roots, source-vs-target location rewriting
Progress and prose	lualine LSP progress and Markdown/MDX formatting behavior