feat: preconfigure Python with Astral ty and Ruff

src/main.rs

@@ -37,8 +37,9 @@ Ruby config: $XDG_CONFIG_HOME/vamp/config.rb or ~/.config/vamp/config.rb
 Set VAMP_RUBY to choose the Ruby executable.
 
 Native LSP is disabled by default: config.lsp[\"rust\"] = true enables a preset
-Presets: rust -> rust-analyzer, python -> pylsp, ruby -> solargraph stdio
+Presets: rust -> rust-analyzer, python -> ty server + ruff server, ruby -> solargraph stdio
 Custom languages: config.lsp[\"my-language\"] = { command: [...], extensions: [...] }
+Server stacks: config.lsp[\"python\"] = { servers: [{ command: [...] }, { command: [...] }] }
 LSP commands: :lsp.definition, :lsp.diagnostics, :lsp.hover
 Hover binding: config.bind \"K\", config.core.lsp.hover (no default key)";