remove the "Open ZLS Config" command

This command may let users think that this is where they are supposed
to configure ZLS which is not the case when using VS Code.

package.json

@@ -377,11 +377,6 @@
         "title": "Stop Server",
         "category": "Zig Language Server"
       },
-      {
-        "command": "zig.zls.openconfig",
-        "title": "Open ZLS Config",
-        "category": "Zig Language Server"
-      },
       {
         "command": "zig.zls.update",
         "title": "Check for Server Updates",

src/zls.ts

@@ -1,6 +1,5 @@
 import vscode from "vscode";
 
-import childProcess from "child_process";
 import fs from "fs";
 
 import { LanguageClient, LanguageClientOptions, ResponseError, ServerOptions } from "vscode-languageclient/node";
@@ -270,13 +269,6 @@ async function installVersion(context: vscode.ExtensionContext, version: semver.
     );
 }
 
-async function openConfig() {
-    const zlsPath = getZLSPath();
-    const buffer = childProcess.execFileSync(zlsPath, ["--show-config-path"]);
-    const path: string = buffer.toString("utf8").trimEnd();
-    await vscode.window.showTextDocument(vscode.Uri.file(path), { preview: false });
-}
-
 function checkInstalled(): boolean {
     const zlsPath = vscode.workspace.getConfiguration("zig.zls").get<string>("path");
     if (!zlsPath) {
@@ -317,12 +309,6 @@ export async function activate(context: vscode.ExtensionContext) {
         await startClient();
     });
 
-    vscode.commands.registerCommand("zig.zls.openconfig", async () => {
-        if (!checkInstalled()) return;
-
-        await openConfig();
-    });
-
     vscode.commands.registerCommand("zig.zls.update", async () => {
         if (!checkInstalled()) return;