fix(loadConfig): correct config file extensions from .js to .json and update loading method

src/index.js

@@ -1,6 +1,6 @@
+import { readFile } from "node:fs/promises";
 import os from "node:os";
 import path from "node:path";
-import { pathToFileURL } from "node:url";
 
 export function getUserConfigDir() {
   if (process.platform === "win32") {
@@ -18,11 +18,11 @@ export async function loadConfig(type) {
   switch (configType) {
     case "public":
     case "p":
-      configFileName = "public-config.js";
+      configFileName = "public-config.json";
       break;
     case "confidential":
     case "c":
-      configFileName = "confidential-config.js";
+      configFileName = "confidential-config.json";
       break;
     default:
       configFileName = null;
@@ -35,7 +35,6 @@ export async function loadConfig(type) {
   }
 
   const configPath = path.join(configBaseDir, "sk-az-tools", configFileName);
-  const configUrl = pathToFileURL(configPath).href;
-  const { config } = await import(configUrl);
-  return config;
+  const configJson = await readFile(configPath, "utf8");
+  return JSON.parse(configJson);
 }