rename package from @push.rocks/npmextra to @push.rocks/smartconfig

- Rename all source files from npmextra.* to simpler names (classes.appdata.ts, etc.)
- Rename Npmextra class to Smartconfig
- Config file changed from npmextra.json to smartconfig.json
- KV store path changed from ~/.npmextra/kv to ~/.smartconfig/kv
- Update all imports, tests, and metadata

test/test.appdata.ts

@@ -1,7 +1,7 @@
 import { expect, tap } from '@git.zone/tstest/tapbundle';
 
 // module to test
-import * as npmextra from '../ts/index.js';
+import * as smartconfig from '../ts/index.js';
 
 interface ITestOptions {
   hi: string;
@@ -11,10 +11,10 @@ interface ITestOptions {
   };
 }
 
-let testAppdata: npmextra.AppData<ITestOptions>;
+let testAppdata: smartconfig.AppData<ITestOptions>;
 
 tap.test('should create a valid AppData', async () => {
-  testAppdata = new npmextra.AppData<ITestOptions>({
+  testAppdata = new smartconfig.AppData<ITestOptions>({
     envMapping: {
       deep: {
         deep1: '',