move sdk packages to its own folder and rename api & dashboard

apps/test/src/pages/_app.tsx

@@ -1,4 +1,4 @@
-import { OpenpanelProvider } from '@mixan-test/next';
+import { OpenpanelProvider } from '@mixan-test/nextjs';
 import type { AppProps } from 'next/app';
 
 export default function MyApp({ Component, pageProps }: AppProps) {

apps/test/src/pages/test.tsx

@@ -5,7 +5,7 @@ import {
   increment,
   setProfile,
   trackEvent,
-} from '@mixan-test/next';
+} from '@mixan-test/nextjs';
 import Link from 'next/link';
 
 export default function Test() {