feat: add lua, html/css/json, nix, and oxlint LSPs; add global .git root marker

src/root.ts

@@ -1,7 +1,7 @@
 import * as fs from "node:fs";
 import * as path from "node:path";
 import { pathToFileURL, fileURLToPath } from "node:url";
-import { servers } from "../server.ts";
+import { servers, globalRootMarkers } from "../server.ts";
 import type { ServerConfig } from "./types.ts";
 import { UnsupportedExtensionError } from "./types.ts";
 
@@ -31,8 +31,9 @@ export function pickServer(filePath: string): ServerConfig {
 export function findRoot(filePath: string, markers: string[]): string {
   let dir = path.dirname(path.resolve(filePath));
   const { root } = path.parse(dir);
+  const allMarkers = [...markers, ...globalRootMarkers];
   while (true) {
-    for (const m of markers) {
+    for (const m of allMarkers) {
       if (fs.existsSync(path.join(dir, m))) return dir;
     }
     if (dir === root) return path.dirname(path.resolve(filePath));