Add guide and tooling for local packages registry setup (#26110)

devenv/local-npm/conf/nginx/sites-enabled/verdaccio-conf

@@ -0,0 +1,14 @@
+server {
+  listen 80 default_server;
+	access_log /var/log/nginx/verdaccio.log;
+	charset utf-8;
+  location / {
+    proxy_pass              http://grafana-npm.local:4873/;
+    proxy_set_header        Host $host;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header X-NginX-Proxy true;
+    proxy_ssl_session_reuse off;
+    proxy_set_header Host $http_host;
+    proxy_redirect off;
+  }
+}