feat: migrate LSP to opt-in native language servers

src/main.rs

@@ -36,8 +36,9 @@ Buffers: :edit PATH, :buffers, :buffer N, :bnext, :bprev, :bdelete[!] [N]
 Ruby config: $XDG_CONFIG_HOME/vamp/config.rb or ~/.config/vamp/config.rb
 Set VAMP_RUBY to choose the Ruby executable.
 
-Optional LSP Ruby plugin: config.plugin PATH, options: { servers: [...] }
-LSP commands when enabled: :lsp_definition, :lsp_diagnostics";
+Native LSP is disabled by default: config.lsp[\"rust\"] = true enables a preset
+Custom languages: config.lsp[\"my-language\"] = { command: [...], extensions: [...] }
+LSP commands: :lsp_definition, :lsp_diagnostics";
 
 struct Options {
     file: Option<PathBuf>,